146-647: Bangladesh Bank Building is a high-rise building located in Dhaka , Bangladesh . It is located in Motijheel , the central business district. It rises to a height of 115 metres (377 ft) and has 31 floors. It houses the headquarters of Bangladesh Bank . The building is one of the earliest high-rises in the city. Built in 1985, it was the tallest building in Bangladesh for 27 years, until 2012, when City Centre Dhaka Topped-out at 171 metres (561 ft). Currently,
292-455: A conductor 's surface, since otherwise there would be a force along the surface of the conductor that would move the charge carriers to even the potential across the surface. The electric field was formally defined as the force exerted per unit charge, but the concept of potential allows for a more useful and equivalent definition: the electric field is the local gradient of the electric potential. Usually expressed in volts per metre,
438-461: A force on each other, an effect that was known, though not understood, in antiquity. A lightweight ball suspended by a fine thread can be charged by touching it with a glass rod that has itself been charged by rubbing with a cloth. If a similar ball is charged by the same glass rod, it is found to repel the first: the charge acts to force the two balls apart. Two balls that are charged with a rubbed amber rod also repel each other. However, if one ball
584-409: A steady state current, but instead blocks it. The inductor is a conductor, usually a coil of wire, that stores energy in a magnetic field in response to the current through it. When the current changes, the magnetic field does too, inducing a voltage between the ends of the conductor. The induced voltage is proportional to the time rate of change of the current. The constant of proportionality
730-456: A central role in many modern technologies, serving in electric power where electric current is used to energise equipment, and in electronics dealing with electrical circuits involving active components such as vacuum tubes , transistors , diodes and integrated circuits , and associated passive interconnection technologies. The study of electrical phenomena dates back to antiquity, with theoretical understanding progressing slowly until
876-603: A change in the course of the Ganges, the strategic importance of Gour was lost. Dhaka was viewed with strategic importance due to the Mughal need to consolidate control in eastern Bengal. The Mughals also planned to extend their empire beyond into Assam and Arakan . Dhaka and Chittagong became the eastern frontiers of the Mughal Empire. Dhaka became the capital of the Mughal province of Bengal, Bihar, and Orissa in 1610 with
1022-432: A charge of Q coulombs every t seconds passing through an electric potential ( voltage ) difference of V is where Electric power is generally supplied to businesses and homes by the electric power industry . Electricity is usually sold by the kilowatt hour (3.6 MJ) which is the product of power in kilowatts multiplied by running time in hours. Electric utilities measure power using electricity meters , which keep
1168-516: A common reference point to which potentials may be expressed and compared is useful. While this could be at infinity, a much more useful reference is the Earth itself, which is assumed to be at the same potential everywhere. This reference point naturally takes the name earth or ground . Earth is assumed to be an infinite source of equal amounts of positive and negative charge and is therefore electrically uncharged—and unchargeable. Electric potential
1314-472: A current of one amp. The capacitor is a development of the Leyden jar and is a device that can store charge, and thereby storing electrical energy in the resulting field. It consists of two conducting plates separated by a thin insulating dielectric layer; in practice, thin metal foils are coiled together, increasing the surface area per unit volume and therefore the capacitance . The unit of capacitance
1460-494: A dampened kite string and flown the kite in a storm-threatened sky . A succession of sparks jumping from the key to the back of his hand showed that lightning was indeed electrical in nature. He also explained the apparently paradoxical behavior of the Leyden jar as a device for storing large amounts of electrical charge in terms of electricity consisting of both positive and negative charges. In 1775, Hugh Williamson reported
1606-758: A hotbed for European rivalries. The British moved to oust the last independent Nawab of Bengal in 1757, who was allied with the French. Due to the defection of Nawab's army chief Mir Jafar to the British side, the last Nawab lost the Battle of Plassey . After the Battle of Buxar in 1765, the Treaty of Allahabad allowed the British East India Company to become the tax collector in Bengal on behalf of
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#17327722534341752-430: A jurisdiction covering modern-day Bangladesh and eastern India , including the modern-day Indian states of West Bengal , Bihar and Orissa . This province was known as Bengal Subah . The city was founded during the reign of Emperor Jahangir . Emperor Shah Jahan visited Dhaka in 1624 and stayed in the city for a week, four years before he became emperor in 1628. Dhaka became one of the richest and greatest cities in
1898-471: A jurisdiction covering most of modern-day Bangladesh and all of what is now Northeast India . The partition was the brainchild of Lord Curzon , who finally acted on British ideas for partitioning Bengal to improve administration, education, and business. Dhaka became the seat of the Eastern Bengal and Assam Legislative Council . While Dhaka was the main capital throughout the year, Shillong acted as
2044-425: A large lightning cloud may be as high as 100 MV and have discharge energies as great as 250 kWh. The field strength is greatly affected by nearby conducting objects, and it is particularly intense when it is forced to curve around sharply pointed objects. This principle is exploited in the lightning conductor , the sharp spike of which acts to encourage the lightning strike to develop there, rather than to
2190-402: A millimetre per second, the electric field that drives them itself propagates at close to the speed of light , enabling electrical signals to pass rapidly along wires. Current causes several observable effects, which historically were the means of recognising its presence. That water could be decomposed by the current from a voltaic pile was discovered by Nicholson and Carlisle in 1800,
2336-553: A more reliable source of electrical energy than the electrostatic machines previously used. The recognition of electromagnetism , the unity of electric and magnetic phenomena, is due to Hans Christian Ørsted and André-Marie Ampère in 1819–1820. Michael Faraday invented the electric motor in 1821, and Georg Ohm mathematically analysed the electrical circuit in 1827. Electricity and magnetism (and light) were definitively linked by James Clerk Maxwell , in particular in his " On Physical Lines of Force " in 1861 and 1862. While
2482-608: A movement for self-determination . On 7 March 1971, Awami League leader Sheikh Mujibur Rahman addressed a massive public gathering at the Ramna Race Course Maidan in Dhaka, in which he warned of an independence struggle. Subsequently, East Pakistan came under a non-co-operation movement against the Pakistani state. On Pakistan's Republic Day (23 March 1971), Bangladeshi flags were hoisted throughout Dhaka in
2628-425: A positive current is defined as having the same direction of flow as any positive charge it contains, or to flow from the most positive part of a circuit to the most negative part. Current defined in this manner is called conventional current . The motion of negatively charged electrons around an electric circuit , one of the most familiar forms of current, is thus deemed positive in the opposite direction to that of
2774-420: A positive or negative electric charge produces an electric field . The motion of electric charges is an electric current and produces a magnetic field . In most applications, Coulomb's law determines the force acting on an electric charge. Electric potential is the work done to move an electric charge from one point to another within an electric field, typically measured in volts . Electricity plays
2920-523: A potential future Mughal empress before her premature death. Internal conflict in the Mughal court cut short Dhaka's growth as an imperial city. Prince Azam Shah's rivalry with Murshid Quli Khan resulted in Dhaka losing its status as the provincial capital. In 1717, the provincial capital was shifted to Murshidabad where Murshid Quli Khan declared himself as the Nawab of Bengal . Under the Nawabs of Bengal,
3066-891: A practical generator, but it showed the possibility of generating electric power using magnetism, a possibility that would be taken up by those that followed on from his work. An electric circuit is an interconnection of electric components such that electric charge is made to flow along a closed path (a circuit), usually to perform some useful task. The components in an electric circuit can take many forms, which can include elements such as resistors , capacitors , switches , transformers and electronics . Electronic circuits contain active components , usually semiconductors , and typically exhibit non-linear behaviour, requiring complex analysis. The simplest electric components are those that are termed passive and linear : while they may temporarily store energy, they contain no sources of it, and exhibit linear responses to stimuli. The resistor
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#17327722534343212-406: A process now known as electrolysis . Their work was greatly expanded upon by Michael Faraday in 1833. Current through a resistance causes localised heating, an effect James Prescott Joule studied mathematically in 1840. One of the most important discoveries relating to current was made accidentally by Hans Christian Ørsted in 1820, when, while preparing a lecture, he witnessed the current in
3358-471: A rapidly changing one. Electric power is the rate at which electric energy is transferred by an electric circuit . The SI unit of power is the watt , one joule per second . Electric power, like mechanical power , is the rate of doing work , measured in watts , and represented by the letter P . The term wattage is used colloquially to mean "electric power in watts." The electric power in watts produced by an electric current I consisting of
3504-489: A resistance is directly proportional to the potential difference across it. The resistance of most materials is relatively constant over a range of temperatures and currents; materials under these conditions are known as 'ohmic'. The ohm , the unit of resistance, was named in honour of Georg Ohm , and is symbolised by the Greek letter Ω. 1 Ω is the resistance that will produce a potential difference of one volt in response to
3650-432: A result, many of the immediate environmental burdens of river pollution are borne by these low-income residents. Water bodies and wetlands around Dhaka are facing destruction as these are being filled up to construct multi-storied buildings and other real estate developments. Coupled with pollution, such erosion of natural habitats threatens to destroy much of the regional biodiversity. Electricity Electricity
3796-595: A running total of the electric energy delivered to a customer. Unlike fossil fuels , electricity is a low entropy form of energy and can be converted into motion or many other forms of energy with high efficiency. Electronics deals with electrical circuits that involve active electrical components such as vacuum tubes , transistors , diodes , sensors and integrated circuits , and associated passive interconnection technologies. The nonlinear behaviour of active components and their ability to control electron flows makes digital switching possible, and electronics
3942-431: A scientific curiosity into an essential tool for modern life. In 1887, Heinrich Hertz discovered that electrodes illuminated with ultraviolet light create electric sparks more easily. In 1905, Albert Einstein published a paper that explained experimental data from the photoelectric effect as being the result of light energy being carried in discrete quantized packets, energising electrons. This discovery led to
4088-575: A series of experiments to the Royal Society on the shocks delivered by the electric eel ; that same year the surgeon and anatomist John Hunter described the structure of the fish's electric organs . In 1791, Luigi Galvani published his discovery of bioelectromagnetics , demonstrating that electricity was the medium by which neurons passed signals to the muscles. Alessandro Volta 's battery, or voltaic pile , of 1800, made from alternating layers of zinc and copper, provided scientists with
4234-515: A series of observations on static electricity around 600 BCE, from which he believed that friction rendered amber magnetic , in contrast to minerals such as magnetite , which needed no rubbing. Thales was incorrect in believing the attraction was due to a magnetic effect, but later science would prove a link between magnetism and electricity. According to a controversial theory, the Parthians may have had knowledge of electroplating , based on
4380-504: A show of resistance. On 25 March 1971, the Pakistan Army launched military operations under Operation Searchlight against the population of East Pakistan. Dhaka bore the brunt of the army's atrocities, witnessing a genocide and a campaign of wide-scale repression, with the arrest, torture, and murder of the city's civilians, students, intelligentsia , political activists and religious minorities. The army faced mutinies from
4526-477: A solid crystal (such as a germanium crystal) to detect a radio signal by the contact junction effect. In a solid-state component, the current is confined to solid elements and compounds engineered specifically to switch and amplify it. Current flow can be understood in two forms: as negatively charged electrons , and as positively charged electron deficiencies called holes . These charges and holes are understood in terms of quantum physics. The building material
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4672-583: A trilateral summit between India, Pakistan, and Bangladesh in 1998; the summit of the D-8 Organization for Economic Cooperation in 1999 and conferences of the Commonwealth , SAARC, the OIC and United Nations agencies during various years. In the 1990s and 2000s, Dhaka experienced improved economic growth and the emergence of affluent business districts and satellite towns. Between 1990 and 2005,
4818-455: A watch station; or it is the same as Davaka, mentioned in the Allahabad pillar inscription of Samudragupta as an eastern frontier kingdom. According to Rajatarangini written by a Kashmiri Brahman, Kalhana , the region was originally known as Dhakka . The word Dhakka means watchtower . Bikrampur and Sonargaon —the earlier strongholds of Bengal rulers were situated nearby. So Dhaka
4964-535: A well-defined central business district . Old Dhaka is the historic commercial centre, but most development has moved to the north. In 1985, the area around Motijheel was considered the "modern" CBD, while by 2005 Gulshan was considered the "newest" part of the CBD. Many Bangladeshi government institutions can be found in Motijheel, Segunbagicha , Tejgaon , Karwan Bazar , and Sher-e-Bangla Nagar . Much activity
5110-511: A wire disturbing the needle of a magnetic compass. He had discovered electromagnetism , a fundamental interaction between electricity and magnetics. The level of electromagnetic emissions generated by electric arcing is high enough to produce electromagnetic interference , which can be detrimental to the workings of adjacent equipment. In engineering or household applications, current is often described as being either direct current (DC) or alternating current (AC). These terms refer to how
5256-448: A wire suspended from a pivot above the magnet and dipped into the mercury. The magnet exerted a tangential force on the wire, making it circle around the magnet for as long as the current was maintained. Experimentation by Faraday in 1831 revealed that a wire moving perpendicular to a magnetic field developed a potential difference between its ends. Further analysis of this process, known as electromagnetic induction , enabled him to state
5402-402: A wire. The informal term static electricity refers to the net presence (or 'imbalance') of charge on a body, usually caused when dissimilar materials are rubbed together, transferring charge from one to the other. Charge can be measured by a number of means, an early instrument being the gold-leaf electroscope , which although still in use for classroom demonstrations, has been superseded by
5548-584: Is a scalar quantity . That is, it has only magnitude and not direction. It may be viewed as analogous to height : just as a released object will fall through a difference in heights caused by a gravitational field, so a charge will 'fall' across the voltage caused by an electric field. As relief maps show contour lines marking points of equal height, a set of lines marking points of equal potential (known as equipotentials ) may be drawn around an electrostatically charged object. The equipotentials cross all lines of force at right angles. They must also lie parallel to
5694-411: Is a vector field . The study of electric fields created by stationary charges is called electrostatics . The field may be visualised by a set of imaginary lines whose direction at any point is the same as that of the field. This concept was introduced by Faraday, whose term ' lines of force ' still sometimes sees use. The field lines are the paths that a point positive charge would seek to make as it
5840-473: Is also the largest Bengali-speaking city in the world. The area of Dhaka has been inhabited since the first millennium. An early modern city developed from the 17th century as a provincial capital and commercial centre of the Mughal Empire . Dhaka was the capital of a proto-industrialized Mughal Bengal for 75 years (1608–39 and 1660–1704). It was the hub of the muslin trade in Bengal and one of
5986-452: Is an important difference. Gravity always acts in attraction, drawing two masses together, while the electric field can result in either attraction or repulsion. Since large bodies such as planets generally carry no net charge, the electric field at a distance is usually zero. Thus gravity is the dominant force at distance in the universe, despite being much weaker. An electric field generally varies in space, and its strength at any one point
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6132-470: Is associated with two Nobel laureates. Dhaka's annual Bengali New Year parade, its Jamdani sari, and its rickshaw art have been recognized by UNESCO as the intangible cultural heritage of humanity. The city has produced many writers and poets in several languages, especially in Bengali and English. The origins of the name Dhaka are uncertain. It may derive from the dhak tree, which was once common in
6278-403: Is built over a network of rivers. The city’s life is strongly intertwined with the rivers, as they are used for multiple purposes, including transportation. Except Old Dhaka , which is an old bazaar -style neighbourhood, the layout of the city follows a grid pattern with organic development influenced by traditional South Asian as well as Middle Eastern and Western patterns. Growth of the city
6424-411: Is centred around a few large roads, where road laws are rarely obeyed and street vendors and beggars are frequently encountered. For much of recent history, Dhaka was characterized by roadside markets and small shops that sold a wide variety of goods. Recent years have seen the widespread construction of shopping malls. Two of the largest shopping malls in the city and the wider South Asian region are
6570-401: Is charged by the glass rod, and the other by an amber rod, the two balls are found to attract each other. These phenomena were investigated in the late eighteenth century by Charles-Augustin de Coulomb , who deduced that charge manifests itself in two opposing forms. This discovery led to the well-known axiom: like-charged objects repel and opposite-charged objects attract . The force acts on
6716-473: Is defined as negative, and that by protons is positive. Before these particles were discovered, Benjamin Franklin had defined a positive charge as being the charge acquired by a glass rod when it is rubbed with a silk cloth. A proton by definition carries a charge of exactly 1.602 176 634 × 10 coulombs . This value is also defined as the elementary charge . No object can have a charge smaller than
6862-483: Is defined as the force (per unit charge) that would be felt by a stationary, negligible charge if placed at that point. The conceptual charge, termed a ' test charge ', must be vanishingly small to prevent its own electric field disturbing the main field and must also be stationary to prevent the effect of magnetic fields . As the electric field is defined in terms of force , and force is a vector , having both magnitude and direction , it follows that an electric field
7008-531: Is integral to applications spanning transport , heating , lighting , communications , and computation , making it the foundation of modern industrial society. Long before any knowledge of electricity existed, people were aware of shocks from electric fish . Ancient Egyptian texts dating from 2750 BCE described them as the "protectors" of all other fish. Electric fish were again reported millennia later by ancient Greek , Roman and Arabic naturalists and physicians . Several ancient writers, such as Pliny
7154-450: Is largely unplanned and is focused on the northern regions and around the city centre, where many of the more affluent neighbourhoods may be found. Most of the construction in the city consists of concrete high-rise buildings . Middle-class and upper-class housing, along with commercial and industrial areas, occupy most of the city. However, nearly one third of Dhaka's population lives in slums , as of 2016 (see below). Dhaka does not have
7300-406: Is mediated by the magnetic field each current produces and forms the basis for the international definition of the ampere . This relationship between magnetic fields and currents is extremely important, for it led to Michael Faraday's invention of the electric motor in 1821. Faraday's homopolar motor consisted of a permanent magnet sitting in a pool of mercury . A current was allowed through
7446-415: Is most often a crystalline semiconductor . Solid-state electronics came into its own with the emergence of transistor technology. The first working transistor, a germanium -based point-contact transistor , was invented by John Bardeen and Walter Houser Brattain at Bell Labs in 1947, followed by the bipolar junction transistor in 1948. By modern convention, the charge carried by electrons
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#17327722534347592-474: Is one of the most prominent features of modern Dhaka. In 2014, it was reported that only 7% of the city was covered by roads. The first phase of Dhaka Metro Rail from Uttara to Agargaon was inaugurated by Prime Minister Sheikh Hasina on 28 December 2022. However, nearly one third of Dhaka's population lives in slums , as of 2016. The city's main river, the Buriganga River , has become one of
7738-403: Is perhaps the simplest of passive circuit elements: as its name suggests, it resists the current through it, dissipating its energy as heat. The resistance is a consequence of the motion of charge through a conductor: in metals, for example, resistance is primarily due to collisions between electrons and ions. Ohm's law is a basic law of circuit theory , stating that the current passing through
7884-531: Is subjected to transients , such as when first energised. The concept of the electric field was introduced by Michael Faraday . An electric field is created by a charged body in the space that surrounds it, and results in a force exerted on any other charges placed within the field. The electric field acts between two charges in a similar manner to the way that the gravitational field acts between two masses , and like it, extends towards infinity and shows an inverse square relationship with distance. However, there
8030-406: Is termed the inductance . The unit of inductance is the henry , named after Joseph Henry , a contemporary of Faraday. One henry is the inductance that will induce a potential difference of one volt if the current through it changes at a rate of one ampere per second. The inductor's behaviour is in some regards converse to that of the capacitor: it will freely allow an unchanging current, but opposes
8176-415: Is the farad , named after Michael Faraday , and given the symbol F : one farad is the capacitance that develops a potential difference of one volt when it stores a charge of one coulomb. A capacitor connected to a voltage supply initially causes a current as it accumulates charge; this current will however decay in time as the capacitor fills, eventually falling to zero. A capacitor will therefore not permit
8322-681: Is the namesake of the Higgs boson ); linguist Muhammad Shahidullah , Sir A F Rahman (the first Bengali vice-chancellor of the university); and historian R. C. Majumdar . The university was established in 1921 by the Imperial Legislative Council . It started with three faculties and 12 departments, covering the subjects of Sanskrit, Bengali, English, liberal arts , history, Arabic, Islamic Studies, Persian, Urdu, philosophy, economics, politics, physics, chemistry, mathematics, and law. The East Bengal Cinematograph Company produced
8468-605: Is the seat of the Government of Bangladesh , many Bangladeshi companies , and leading Bangladeshi educational, scientific, research, and cultural organizations. Since its establishment as a modern capital city, the population, area and social and economic diversity of Dhaka have grown tremendously. The city is now one of the most densely industrialized regions in the country. The city accounts for 35% of Bangladesh's economy . The Dhaka Stock Exchange has over 750 listed companies. Dhaka hosts over 50 diplomatic missions ; as well as
8614-430: Is the set of physical phenomena associated with the presence and motion of matter possessing an electric charge . Electricity is related to magnetism , both being part of the phenomenon of electromagnetism , as described by Maxwell's equations . Common phenomena are related to electricity, including lightning , static electricity , electric heating , electric discharges and many others. The presence of either
8760-529: Is therefore 0 at all places inside the body. This is the operating principal of the Faraday cage , a conducting metal shell which isolates its interior from outside electrical effects. The principles of electrostatics are important when designing items of high-voltage equipment. There is a finite limit to the electric field strength that may be withstood by any medium. Beyond this point, electrical breakdown occurs and an electric arc causes flashover between
8906-707: Is this history that is today still reflected in the faded grandeur of the old city, now crumbling due to decades of neglect. The narrow, winding, high-walled lanes and alleyways, the old high-ceilinged houses with verandas and balconies, the old neighbourhoods, the graveyards and gardens, the mosques, the grand old mansions – these are all still there if one goes looking". Railway stations, postal departments, civil service posts and river port stations were often staffed by Anglo-Indians . The city's hinterland supplied rice, jute, gunny sacks , turmeric, ginger, leather hides, silk, rugs, saltpeter , salt, sugar, indigo , cotton, and iron. British opium policy in Bengal contributed to
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#17327722534349052-409: Is usually measured in volts , and one volt is the potential for which one joule of work must be expended to bring a charge of one coulomb from infinity. This definition of potential, while formal, has little practical application, and a more useful concept is that of electric potential difference , and is the energy required to move a unit charge between two specified points. An electric field has
9198-595: Is widely considered to be the most densely populated built-up urban area in the world. Dhaka is the most important cultural, economic, and scientific hub of Eastern South Asia , as well as a major Muslim-majority city . Dhaka ranks third in South Asia and 39th in the world in terms of GDP . Lying on the Ganges Delta , it is bounded by the Buriganga , Turag , Dhaleshwari and Shitalakshya rivers. Dhaka
9344-536: Is widely used in information processing , telecommunications , and signal processing . Interconnection technologies such as circuit boards , electronics packaging technology, and other varied forms of communication infrastructure complete circuit functionality and transform the mixed components into a regular working system . Today, most electronic devices use semiconductor components to perform electron control. The underlying principles that explain how semiconductors work are studied in solid state physics , whereas
9490-613: The Dutch East Indies . Bengal accounted for 50% of textiles and 80% of silks in Dutch textile imports from Asia. Silk was also exported to premodern Japan . The region had a large shipbuilding industry which supplied the Mughal Navy . The shipbuilding output of Bengal during the 16th and 17th centuries stood at 223,250 tons annually, compared to 23,061 tons produced by North America from 1769 to 1771. The Mughals decorated
9636-818: The East Pakistan Rifles and the Bengali police. Large parts of the city were burnt and destroyed, including Hindu neighbourhoods. Much of the city's population was either displaced or forced to flee to the countryside. Dhaka was struck with numerous air raids by the Indian Air Force in December . The Pakistan Eastern Command surrendered to Lt. Gen. Jagjit Singh Aurora at the Ramna Race Course in Dhaka on 16 December 1971. After independence, Dhaka's population grew from several hundred thousand to several million in five decades. Dhaka
9782-976: The Jamuna Future Park and Bashundhara City . Under the Köppen climate classification , Dhaka has a tropical savanna climate ( Köppen Aw ). The city has a distinct monsoonal season, with an annual average temperature of 26 °C (79 °F) and monthly means varying between 19 °C (66 °F) in January and 29 °C (84 °F) in May. Approximately 87% of the average annual rainfall of 2,123 millimetres (83.6 inches) occurs between May and October. There are many parks within Dhaka City, including Ramna Park , Suhrawardy Udyan , Shishu Park , National Botanical Garden , Baldha Garden , Chandrima Uddan , Gulshan Park and Dhaka Zoo . Almost 10% of
9928-947: The Khasi and Jaintia Hills , the Naga Hills and the Lushai Hills in Surma Valley Division; and Goalpara , Kamrup , the Garo Hills , Darrang , Nowgong , Sibsagar and Lakhimpur in Assam Valley Division. The province was bordered by Cooch Behar State , Hill Tipperah and the Kingdom of Bhutan . On the political front, partition allowed Dhaka to project itself as the standard-bearer of Muslim communities in British India ; as opposed to
10074-625: The Naib Nazim of Dhaka was in charge of the city. The Naib Nazim was the deputy governor of Bengal. He also dealt with the upkeep of the Mughal Navy. The Naib Nazim was in charge of the Dhaka Division, which included Dhaka, Comilla , and Chittagong. Dhaka Division was one of the four divisions under the Nawabs of Bengal. The Nawabs of Bengal allowed European trading companies to establish factories across Bengal. The region then became
10220-721: The Neo-Latin word electricus ("of amber" or "like amber", from ἤλεκτρον, elektron , the Greek word for "amber") to refer to the property of attracting small objects after being rubbed. This association gave rise to the English words "electric" and "electricity", which made their first appearance in print in Thomas Browne 's Pseudodoxia Epidemica of 1646. Isaac Newton made early investigations into electricity, with an idea of his written down in his book Opticks arguably
10366-601: The Opium Wars with China . American traders collected artwork, handicrafts, terracotta, sculptures, religious and literary texts, manuscripts, and military weapons from Bengal. Some objects from the region are on display in the Peabody Essex Museum . The increase in international trade led to profits for many families in the city, allowing them to buy imported luxury goods. During the Indian mutiny of 1857 ,
10512-485: The capital and largest city of Bangladesh . It is the ninth-largest and seventh-most densely populated city in the world with a density of 23,234 people per square kilometer within a total area of approximately 300 square kilometers. Dhaka is a megacity , and has a population of 10.2 million residents as of 2024, and a population of over 23.9 million residents in Dhaka Metropolitan Area . It
10658-423: The electromagnetic force , one of the four fundamental forces of nature. Experiment has shown charge to be a conserved quantity , that is, the net charge within an electrically isolated system will always remain constant regardless of any changes taking place within that system. Within the system, charge may be transferred between bodies, either by direct contact, or by passing along a conducting material, such as
10804-641: The hansom cab as public transport in 1856. The number of carriages increased from 60 in 1867 to 600 in 1889. A modern civic water system was introduced in 1874. In 1885, the Dhaka State Railway was opened with a 144 km metre gauge (1000 mm) rail line connecting Mymensingh and the Port of Narayanganj through Dhaka. The city later became a hub of the Eastern Bengal State Railway . The first film shown in Dhaka
10950-522: The quantum revolution. Einstein was awarded the Nobel Prize in Physics in 1921 for "his discovery of the law of the photoelectric effect". The photoelectric effect is also employed in photocells such as can be found in solar panels . The first solid-state device was the " cat's-whisker detector " first used in the 1900s in radio receivers. A whisker-like wire is placed lightly in contact with
11096-452: The strong interaction , but unlike that force it operates over all distances. In comparison with the much weaker gravitational force , the electromagnetic force pushing two electrons apart is 10 times that of the gravitational attraction pulling them together. Charge originates from certain types of subatomic particles , the most familiar carriers of which are the electron and proton . Electric charge gives rise to and interacts with
11242-541: The 17th and 18th centuries. The development of the theory of electromagnetism in the 19th century marked significant progress, leading to electricity's industrial and residential application by electrical engineers by the century's end. This rapid expansion in electrical technology at the time was the driving force behind the Second Industrial Revolution , with electricity's versatility driving transformations in both industry and society. Electricity
11388-545: The 1936 discovery of the Baghdad Battery , which resembles a galvanic cell , though it is uncertain whether the artifact was electrical in nature. Electricity would remain little more than an intellectual curiosity for millennia until 1600, when the English scientist William Gilbert wrote De Magnete , in which he made a careful study of electricity and magnetism, distinguishing the lodestone effect from static electricity produced by rubbing amber. He coined
11534-764: The Assam Valley Division, Chittagong Division, Dacca Division, Rajshahi Division, and the Surma Valley Division. There were a total of 30 districts in Eastern Bengal and Assam, including Dacca, Mymensingh, Faridpur and Backergunge in Dacca Division; Tippera , Noakhali, Chittagong and the Hill Tracts in Chittagong Division; Rajshahi, Dinajpur, Jalpaiguri , Rangpur, Bogra, Pabna and Malda in Rajshahi Division; Sylhet, Cachar ,
11680-656: The Elder and Scribonius Largus , attested to the numbing effect of electric shocks delivered by electric catfish and electric rays , and knew that such shocks could travel along conducting objects. Patients with ailments such as gout or headache were directed to touch electric fish in the hope that the powerful jolt might cure them. Ancient cultures around the Mediterranean knew that certain objects, such as rods of amber , could be rubbed with cat's fur to attract light objects like feathers. Thales of Miletus made
11826-776: The English East India Company, the Dutch East India Company , and French East India Company . The property of the Ahsan Manzil was initially bought by the French for their factory and later sold to the Dhaka Nawab Family. The Portuguese were reportedly responsible for introducing cheese . Dhaka saw an influx of migrants during the Mughal Empire. An Armenian community from the Safavid Empire settled in Dhaka and
11972-514: The Liberation War Museum. The Nawabs of Dhaka owned Rolls-Royces . Austin cars were widely used. Beauty Boarding was a popular inn and restaurant. Dhaka's fortunes changed in the early 20th century. British neglect of Dhaka's urban development was overturned with the first partition of Bengal in 1905, which restored Dhaka's status as a regional capital. The city became the seat of government for Eastern Bengal and Assam , with
12118-592: The Mohsinia Madrasa, Jagannath College and the Ahsanullah School of Engineering . Horse racing was a favourite pastime for elite residents in the city's Ramna Race Course beside the Dhaka Club . The Viceroy of India would often dine and entertain with Bengali aristocrats in the city. Automobiles began appearing after the turn of the century. A 1937 Sunbeam-Talbot Ten was preserved in
12264-593: The Mughal Emperor in Delhi. The Naib Nazim continued to function until 1793 when all his powers were transferred to the East India Company. The city formally passed to the control of the East India Company in 1793. British military raids damaged a lot of the city's infrastructure. The military conflict caused a sharp decline in the urban population. Dhaka's fortunes received a boost with connections to
12410-472: The Mughal government in Bengal. The legacy of cosmopolitan trading communities lives on in the names of neighbourhoods in Old Dhaka, including Farashganj (French Bazaar), Armanitola (Armenian Quarter) and Postogola (Portuguese Quarter). According to those who lived in the historic city, "Dhaka was a courtly, genteel town – the very last flowering, in their telling, of Mughal etiquette and sensibility. It
12556-466: The area, or from Dhakeshwari , the 'patron Hindu goddess' of the region. Another popular theory states that Dhaka refers to a membranophone instrument, dhak which was played by order of Subahdar Islam Khan I during the inauguration of the Bengal capital in 1610. Some references also say it was derived from a Prakrit dialect called Dhaka Bhasa; or Dhakka, used in the Rajtarangini for
12702-399: The bank building is the fourth tallest building in Bangladesh. This Bangladesh -related article is a stub . You can help Misplaced Pages by expanding it . Dhaka Dhaka ( / ˈ d ɑː k ə / DAH -kə or / ˈ d æ k ə / DAK -ə ; Bengali : ঢাকা , romanized : Ḍhākā , pronounced [ˈɖʱaka] ), formerly known as Dacca , is
12848-408: The beginning of the field theory of the electric force. Further work was conducted in the 17th and early 18th centuries by Otto von Guericke , Robert Boyle , Stephen Gray and C. F. du Fay . Later in the 18th century, Benjamin Franklin conducted extensive research in electricity, selling his possessions to fund his work. In June 1752 he is reputed to have attached a metal key to the bottom of
12994-419: The building it serves to protect. The concept of electric potential is closely linked to that of the electric field. A small charge placed within an electric field experiences a force, and to have brought that charge to that point against the force requires work . The electric potential at any point is defined as the energy required to bring a unit test charge from an infinite distance slowly to that point. It
13140-426: The charged particles themselves, hence charge has a tendency to spread itself as evenly as possible over a conducting surface. The magnitude of the electromagnetic force, whether attractive or repulsive, is given by Coulomb's law , which relates the force to the product of the charges and has an inverse-square relation to the distance between them. The electromagnetic force is very strong, second only in strength to
13286-450: The charged parts. Air, for example, tends to arc across small gaps at electric field strengths which exceed 30 kV per centimetre. Over larger gaps, its breakdown strength is weaker, perhaps 1 kV per centimetre. The most visible natural occurrence of this is lightning , caused when charge becomes separated in the clouds by rising columns of air, and raises the electric field in the air to greater than it can withstand. The voltage of
13432-510: The city is connected to a sewer system , whereas 80% is not connected. As a result, the rivers in Dhaka have severe pathogen pollution, as indicated by the fecal coliform count that is several hundred times higher than the recommended national and international standards of less than 200 cfu per litre for bathing and swimming. Chemical surveys in the rivers near Dhaka show extremely high organic pollution loading, high ammonia , and very low dissolved oxygen levels, which are close to zero in
13578-479: The city took place under Governor Shaista Khan. The city then measured 19 by 13 kilometres (11.8 by 8.1 mi), with a population of nearly one million. Dhaka became home to one of the richest elites in Mughal India. The construction of Lalbagh Fort was commenced in 1678 by Prince Azam Shah , who was the governor of Bengal, a son of Emperor Aurangzeb and a future Mughal Emperor himself. The Lalbagh Fort
13724-611: The city with well-laid gardens, tombs, mosques, palaces, and forts. The city was once called the Venice of the East . Under British rule , the city saw the introduction of electricity , railways , cinemas , Western-style universities and colleges and a modern water supply . It became an important administrative and educational centre in the British Raj, as the capital of Eastern Bengal and Assam province after 1905. In 1947, after
13870-596: The city with well-laid-out gardens. Caravanserai included the Bara Katra and Choto Katra . The architect of the palatial Bara Katra was Abul Qashim Al Hussaini Attabatayi Assemani. According to inscriptions in the Bangladesh National Museum, the ownership of Bara Katra was entrusted to an Islamic waqf . The Bara Katra also served as a residence for Mughal governors, including Prince Shah Shuja (the son of Mughal Emperor Shah Jahan). Dhaka
14016-585: The city witnessed revolts by the Bengal Army . Direct rule by the British crown was established following the successful quelling of the mutiny. It bestowed privileges on the Dhaka Nawab Family, which dominated the city's political and social elite. The Dhaka Cantonment was established as a base for the British Indian Army . The British developed the modern city around Ramna , Shahbag Garden, and Victoria Park . Dhaka got its own version of
14162-483: The city's area consists of water: There are 676 ponds and 43 canals. The Buriganga River flows past the southwest outskirts of Dhaka. Its average depth is 7.6 metres (25 ft) and its maximum depth is 18 metres (58 ft). It ranks among the most polluted rivers in the country. The city is surrounded by six interconnected river systems—the Buriganga and Dhaleshwari in the southwest, Turag and Tongi Khal in
14308-438: The city's economy. The hartal rate has declined since 2014. In some years, the city experienced a widespread flash flood during the monsoon. Dhaka is one of the fastest-growing megacities in the world. It is predicted to be one of the world's largest cities by 2025, along with Tokyo , Mexico City , Shanghai , Beijing and New York City . Most of its population are rural migrants, including climate refugees . Congestion
14454-421: The city's population doubled from 6 million to 12 million. There has been increased foreign investment in the city, particularly in the financial and textile manufacturing sectors. Between 2008 and 2011, the government of Bangladesh organized three years of celebrations to mark 400 years since Dhaka's founding as an early modern city. But frequent hartals by political parties have greatly hampered
14600-485: The construction of stately buildings, including the High Court and Curzon Hall. The city was home to diverse groups of people, including Armenians , Jews , Anglo-Indians and Hindus. The Hindus included both Marwaris and Bengali Hindus , with a plurality emerging by 1941 and engaged in professions like teaching, medicine, law, and business. Dhaka was the seat of government for 4 administrative divisions, including
14746-411: The current varies in time. Direct current, as produced by example from a battery and required by most electronic devices, is a unidirectional flow from the positive part of a circuit to the negative. If, as is most common, this flow is carried by electrons, they will be travelling in the opposite direction. Alternating current is any current that reverses direction repeatedly; almost always this takes
14892-516: The design and construction of electronic circuits to solve practical problems are part of electronics engineering . Faraday's and Ampère's work showed that a time-varying magnetic field created an electric field, and a time-varying electric field created a magnetic field. Thus, when either field is changing in time, a field of the other is always induced. These variations are an electromagnetic wave . Electromagnetic waves were analysed theoretically by James Clerk Maxwell in 1864. Maxwell developed
15038-464: The dry season. In addition to the organic and pathogen pollution load from the 1.2 million m of untreated sewage, the rivers receive about 60,000 m of industrial effluent every day from nine major industrial clusters (as of 2021). There are an estimated 500–700 wet processing and dyeing textile factories releasing a range of chemicals including salts, dyes and bleaches, and 155 tanneries discharging heavy metals , including chromium . Four of
15184-478: The early 19th century had seen rapid progress in electrical science, the late 19th century would see the greatest progress in electrical engineering . Through such people as Alexander Graham Bell , Ottó Bláthy , Thomas Edison , Galileo Ferraris , Oliver Heaviside , Ányos Jedlik , William Thomson, 1st Baron Kelvin , Charles Algernon Parsons , Werner von Siemens , Joseph Swan , Reginald Fessenden , Nikola Tesla and George Westinghouse , electricity turned from
15330-593: The economic engine of the Mughal Empire. Dhaka played a key role in the proto-industrialization of Bengal. It was the centre of the muslin trade in Bengal , leading to muslin being called "daka" in distant markets as far away as Central Asia . Mughal India depended on Bengali products like rice, silk and cotton textiles. European East India Companies from Britain, Holland, France, and Denmark also depended on Bengali products. Bengal accounted for 40% of Dutch imports from Asia, with many products being sold to Dutch ships in Bengali harbours and then transported to Batavia in
15476-427: The effect was reciprocal: a current exerts a force on a magnet, and a magnetic field exerts a force on a current. The phenomenon was further investigated by Ampère , who discovered that two parallel current-carrying wires exerted a force upon each other: two wires conducting currents in the same direction are attracted to each other, while wires containing currents in opposite directions are forced apart. The interaction
15622-448: The electronic electrometer . The movement of electric charge is known as an electric current , the intensity of which is usually measured in amperes . Current can consist of any moving charged particles; most commonly these are electrons, but any charge in motion constitutes a current. Electric current can flow through some things, electrical conductors , but will not flow through an electrical insulator . By historical convention,
15768-416: The electrons. However, depending on the conditions, an electric current can consist of a flow of charged particles in either direction, or even in both directions at once. The positive-to-negative convention is widely used to simplify this situation. The process by which electric current passes through a material is termed electrical conduction , and its nature varies with that of the charged particles and
15914-428: The elementary charge, and any amount of charge an object may carry is a multiple of the elementary charge. An electron has an equal negative charge, i.e. −1.602 176 634 × 10 coulombs . Charge is possessed not just by matter , but also by antimatter , each antiparticle bearing an equal and opposite charge to its corresponding particle. The presence of charge gives rise to an electrostatic force: charges exert
16060-467: The end of British rule, the city became the administrative capital of East Pakistan . It was declared the legislative capital of Pakistan in 1962. In 1971, following the Liberation War , it became the capital of independent Bangladesh. In 2008, Dhaka celebrated 400 years as a municipal city. A gamma+ global city , Dhaka is the centre of political, economic and cultural life in Bangladesh. It
16206-480: The ethnolinguistic region. The partition was annulled by an announcement from King George V during the Delhi Durbar in 1911. The British decided to reunite Bengal while the capital of India was shifted to New Delhi from Calcutta. As a "splendid compensation" for the annulment of partition, the British gave the city a newly formed university in the 1920s. The University of Dhaka was initially modelled on
16352-554: The first full-length silent movies in Dhaka during the 1920s, including Sukumari and The Last Kiss . DEVCO, a subsidiary of the Occtavian Steel Company, began widescale power distribution in 1930. The Tejgaon Airport was constructed during World War II as a base for Allied Forces . The Dhaka Medical College was established in 1946. At the time of the partition of India, many rich Hindu families relocated to West Bengal. Their properties were seized by
16498-495: The form of a sine wave . Alternating current thus pulses back and forth within a conductor without the charge moving any net distance over time. The time-averaged value of an alternating current is zero, but it delivers energy in first one direction, and then the reverse. Alternating current is affected by electrical properties that are not observed under steady state direct current, such as inductance and capacitance . These properties however can become important when circuitry
16644-504: The headquarters of BIMSTEC , CIRDAP , and the International Jute Study Group . Dhaka has a renowned culinary heritage. The city's culture is known for its rickshaws , Kacchi Biryani, art festivals , street food, and religious diversity. Dhaka's most prominent architectural landmark is the modernist Jatiyo Sangshad Bhaban ; while it has a heritage of 2000 buildings from the Mughal and British periods. The city
16790-537: The heavily Hindu-dominated city of Calcutta. In 1906, the All India Muslim League was founded in the city during a conference on liberal education hosted by the Nawab of Dhaka and the Aga Khan III . The Muslim population in Dhaka and eastern Bengal generally favoured partition in the hopes of getting better jobs and educational opportunities. Many Bengalis, however, opposed the bifurcation of
16936-433: The imposition of a 75% tax on the export of cotton from Bengal, as well as the surge in imports of cheap, British-manufactured fabrics after the advent of the spinning mule and steam power. The rapid growth of the colonial capital Calcutta contributed to the decline in Dhaka's population and economy in the early 1800s. In 1824, an Anglican bishop described Dhaka as a "city of magnificent ruins". Dhaka hosted factories of
17082-498: The land, which is flat and close to sea level. This leaves Dhaka susceptible to flooding during the monsoon seasons owing to heavy rainfall and cyclones . Due to its location on the lowland plain of the Ganges Delta, the city is fringed by extensive mangroves and tidal flat ecosystems. Dhaka District is bounded by the districts of Gazipur , Tangail , Munshiganj , Rajbari , Narayanganj , and Manikganj . The city of Dhaka
17228-630: The landscape) gardens. Once upon a time, this was the new city; and even though it is today far from the ritziest part of town, the streets here are still wider and the trees more abundant and the greenery more evident than in any other part". Some of the early educational institutions established during the period of British rule include the Dhaka College , the Dhaka Medical School , the Eden College , St. Gregory's School ,
17374-738: The late 1970s. In the 1980s, Dhaka saw the inauguration of the National Parliament House (which won the Aga Khan Award for Architecture ), a new international airport and the Bangladesh National Museum . Bangladesh pioneered the formation of the South Asian Association for Regional Cooperation (SAARC) and hosted its first summit in Dhaka in 1985. A mass uprising in 1990 led to the return of parliamentary democracy . Dhaka hosted
17520-400: The material through which they are travelling. Examples of electric currents include metallic conduction, where electrons flow through a conductor such as metal, and electrolysis , where ions (charged atoms ) flow through liquids, or through plasmas such as electrical sparks. While the particles themselves can move quite slowly, sometimes with an average drift velocity only fractions of
17666-642: The mercantile networks of the British Empire . With the dawn of the Industrial Revolution in Britain , Dhaka became a leading centre of the jute trade , as Bengal accounted for the largest share of the world's jute production. But the British neglected Dhaka's industrial and urban development until the late 19th century. Income from the pre-colonial, proto-industrialized textile industry dried up. Bengali weavers went out of business after
17812-412: The most polluted rivers in the country. Dhaka is located in central Bangladesh at 23°42′N 90°22′E / 23.700°N 90.367°E / 23.700; 90.367 , on the eastern banks of the Buriganga River . The city lies on the lower reaches of the Ganges Delta and covers a total area of 270 square kilometres (100 sq mi). Tropical vegetation and moist soils characterize
17958-471: The most prosperous cities in the world. The Mughal city was named Jahangirnagar ( The City of Jahangir ) in honour of the erstwhile ruling emperor Jahangir . The city's wealthy Mughal elite included princes and the sons of Mughal emperors. The pre-colonial city's glory peaked in the 17th and 18th centuries, when it was home to merchants from across Eurasia . The Port of Dhaka was a major trading post for both riverine and seaborne trade. The Mughals decorated
18104-550: The north, and Balu and Sitalakhya in the east—which support trade, transport, and stormwater drainage. However, the current state of the water quality of the river network is very poor, due to the discharge of untreated wastewater from households and industries. There are several lakes within the city, such as Crescent Lake, Dhanmondi Lake, Baridhara - Gulshan Lake , Banani lake , Uttara Lake, Hatirjheel-Begunbari Lake, 300 Feet Road Prionty lake, Ramna lake. Increasing air and water pollution affects public health and
18250-490: The pre-partition standards. The economy began to industrialize. On the outskirts of the city, the world's largest jute mill was built. The mill produced jute goods which were in high demand during the Korean War . People began building duplex houses. In 1961, Queen Elizabeth II and Prince Philip witnessed the improved living standards of Dhaka's residents. The Intercontinental hotel , designed by William B. Tabler ,
18396-428: The principle, now known as Faraday's law of induction , that the potential difference induced in a closed circuit is proportional to the rate of change of magnetic flux through the loop. Exploitation of this discovery enabled him to invent the first electrical generator in 1831, in which he converted the mechanical energy of a rotating copper disc to electrical energy. Faraday's disc was inefficient and of no use as
18542-405: The quality of life in the city. The air pollution is caused for example by vehicle traffic and congestion. Also, due to the unregulated manufacturing of bricks and other causes, Dhaka has very high levels of fine particulate matter ( PM2.5 ) air pollution. Water pollution is caused by the discharge of municipal wastewater from households and industry without treatment. As of 2011 only 20% of
18688-425: The region, connecting it with North India , Central Asia and the southeastern port city of Chittagong. Before Dhaka, the capital of Bengal was Gour . Even earlier capitals included Pandua , Bikrampur and Sonargaon. The latter was also the seat of Isa Khan and his son Musa Khan , who both headed a confederation of twelve chieftains that resisted Mughal expansion in eastern Bengal during the late 16th century. Due to
18834-528: The residential style of the University of Oxford . It became known as the Oxford of the East because of its residential character. Like Oxford, students in Dhaka were affiliated with their halls of residence instead of their academic departments (this system was dropped after 1947 and students are now affiliated with academic departments). The university's faculty included scientist Satyendra Nath Bose (who
18980-644: The rivers surrounding Dhaka—Buriganaga, Sitalakhya, Balu and Turag—are so polluted that they have been declared as ecologically critical areas in 2009 by the Department of Environment. This makes them unsuitable for any human use. Nevertheless, people living in low-income and slum areas still have a lot of direct contact with river water, exposing them to health risks. They use river water for dish washing, laundry, cleaning fish and vegetables, and personal washing, washing and dyeing denim , washing fish baskets or plastic sheets, collecting plastic waste and fishing. As
19126-454: The special property that it is conservative , which means that the path taken by the test charge is irrelevant: all paths between two specified points expend the same energy, and thus a unique value for potential difference may be stated. The volt is so strongly identified as the unit of choice for measurement and description of electric potential difference that the term voltage sees greater everyday usage. For practical purposes, defining
19272-719: The state under laws that eventually became known as the Vested Property Act . The development of the "real city" began after the partition of India . After partition, Dhaka became known as the second capital of Pakistan . This was formalized in 1962 when Ayub Khan declared the city as the legislative capital under the 1962 constitution . New neighbourhoods began to spring up in formerly barren and agrarian areas. These included Dhanmondi (rice granary), Katabon (thorn forest), Kathalbagan (jackfruit grove), Kalabagan (banana grove), Segunbagicha (teak grove) and Gulshan (flower garden). Living standards rapidly improved from
19418-406: The summer retreat of the administration. Lieutenant Governors were in charge of the province. They resided in Dhaka. The Lt Governors included Sir Bampfylde Fuller (1905-1906), Sir Lancelot Hare (1906-1911), and Sir Charles Stuart Bayley (1911-1912). Their legacy lives on in the names of three major thoroughfares in modern Dhaka, including Hare Road, Bayley Road , and Fuller Road. The period saw
19564-418: The two forces of nature then known. The force on the compass needle did not direct it to or away from the current-carrying wire, but acted at right angles to it. Ørsted's words were that "the electric conflict acts in a revolving manner." The force also depended on the direction of the current, for if the flow was reversed, then the force did too. Ørsted did not fully understand his discovery, but he observed
19710-417: The vector direction of the field is the line of greatest slope of potential, and where the equipotentials lie closest together. Ørsted's discovery in 1821 that a magnetic field existed around all sides of a wire carrying an electric current indicated that there was a direct relationship between electricity and magnetism. Moreover, the interaction seemed different from gravitational and electrostatic forces,
19856-455: The world during the early period of Bengal Subah (1610-1717). The prosperity of Dhaka reached its peak during the administration of governor Shaista Khan (1644-1677 and 1680–1688). Rice was then sold at eight maunds per rupee. Thomas Bowrey, an English merchant sailor who visited the city between 1669 and 1670, wrote that the city was 40 miles in circuit. He estimated the city to be more populated than London with 900,000 people. Bengal became
20002-487: Was declared the national capital by the Constituent Assembly of Bangladesh in 1972. The post-independence period witnessed rapid growth as Dhaka attracted migrant workers from across rural Bangladesh . 60% of population growth has been due to rural migration. The city endured socialist unrest in the early 1970s, followed by a few years of martial law . The stock exchange and free market were restored in
20148-672: Was established in 1956 to coordinate the city's development. The first master plan for the city was drawn up in 1959. The Southeast Asia Treaty Organization established a medical research centre (now called ICDDR,B ) in the city in 1960. The early period of political turbulence was seen between 1947 and 1952, particularly the Bengali Language Movement . From the mid-1960s, the Awami League's 6-point autonomy demands began giving rise to pro-independence aspirations across East Pakistan . In 1969, Sheikh Mujibur Rahman
20294-543: Was forced to move within the field; they are however an imaginary concept with no physical existence, and the field permeates all the intervening space between the lines. Field lines emanating from stationary charges have several key properties: first, that they originate at positive charges and terminate at negative charges; second, that they must enter any good conductor at right angles, and third, that they may never cross nor close in on themselves. A hollow conducting body carries all its charge on its outer surface. The field
20440-575: Was home to an array of Mughal bureaucrats and military officials, as well as members of the imperial family. The city was guarded by Mughal artillery like the Bibi Mariam Cannon (Lady Mary Cannon). Islam Khan I was the first Mughal governor to reside in the city. Khan named it "Jahangirnagar" ( The City of Jahangir ) in honour of the Emperor Jahangir. The name was dropped soon after the English conquered. The main expansion of
20586-440: Was intended to be the viceregal residence of Mughal governors in eastern India. Before the fort's construction could be completed, the prince was recalled by Emperor Aurangzeb. The fort's construction was halted by Shaista Khan after the death of his daughter Pari Bibi , who is buried in a tomb in the centre of the unfinished fort. Pari Bibi, whose name means Fairy Lady , was legendary for her beauty, engaged to Prince Azam Shah, and
20732-553: Was involved in the city's textile trade, paying a 3.5% tax. The Armenians were very active in the city's social life. They opened the Pogose School . Marwaris were the Hindu trading community. Dhaka also became home to Jews and Greeks. The city has a Greek memorial . Several families of Dhaka's elite spoke Urdu and included Urdu poets. Persians also settled in the city to serve as administrators and military commanders of
20878-626: Was most likely used as the watchtower for fortification purpose. The history of urban settlements in the area of modern-day Dhaka dates to the first millennium. The region was part of the ancient district of Bikrampur , which was ruled by the Sena dynasty . Under Islamic rule, it became part of the historic district of Sonargaon , the regional administrative hub of the Delhi and the Bengal Sultanates . The Grand Trunk Road passed through
21024-558: Was opened in 1966. Estonian-American architect Louis I. Kahn was enlisted to design the Dhaka Assembly, which was originally intended to be the federal parliament of Pakistan and later became independent Bangladesh's parliament. The East Pakistan Helicopter Service connected the city to regional towns. The Dhaka Stock Exchange was opened on 28 April 1954. The first local airline Orient Airways began flights between Dhaka and Karachi on 6 June 1954. The Dhaka Improvement Trust
21170-574: Was released from prison amid a mass upsurge which led to the resignation of Ayub Khan in 1970. The city had an influential press with prominent newspapers like the Pakistan Observer , Ittefaq , Forum , and the Weekly Holiday . During the political and constitutional crisis in 1971, the military junta led by Yahya Khan refused to transfer power to the newly elected National Assembly, causing mass riots, civil disobedience, and
21316-775: Was screened on the Riverfront Crown Theatre on 17 April 1898. The film show was organized by the Bedford Bioscope Company. The electricity supply began in 1901. This period is described as being "the colonial-era part of Dhaka, developed by the British during the early 20th century. Similar to colonial boroughs the length and breadth of the Subcontinent, this development was typified by stately government buildings, spacious tree-lined avenues, and sturdy white-washed bungalows set amidst always overgrown (the British never did manage to fully tame
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