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ring current - Laboratory for Atmospheric and Space Physics
ring current - Laboratory for Atmospheric and Space Physics

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Abstract Magnetic Fields Around Black Holes

... are thought to harbor supermassive black holes that range from 1 million solar masses to 1000 times that value and possibly greater. Theory and observation are converging on a model for these objects that involves the conversion of gravitational potential energy of accreting gas to radiation as well ...
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... have received help and guide from many wise and friendly people. I am deeply grateful to them, and I appreciate their help and friendship. During the past six years of graduate study, if I have made any progress, either as a scientific researcher, or as a people in the society, I would like to attri ...
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... thunder clouds are charged with electricity. These charged clouds, when discharged in the atmosphere, give rise to a great spark, which is referred to as lightening. It will interest you to know that the amount of electric current during the discharge is about 20KA. The electric discharge which give ...
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... reported for all 3d TM (V, Cr, Fe, Cu, Ni and Co) doped In2O3 [8-20]. Indium oxide is a cubic structure with 80 atoms per unit cell. It has a wide band-gap energy (3.75 eV), large carrier density when doped with Sn and is transparent in the visible region. All these properties make In2O3 well-suited ...
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... the DEMETER data centre and they are added into the data files. The real lower boundary of the ionosphere is lower at about 80 km. However, considering ∼ 65◦ inclination of the magnetic field in the Central Europe, we get ∼12 km horizontal difference between the magnetic field lines at 80 km and 110 ...
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... A rapid evolution of digitally stored information was achieved in the last half of the 20th century. This process started during the Second World War with the development of early computers, using vacuum tubes for calculations, punched tape for external storage and relays for internal data storage. ...
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... There are several ways to proceed to estimate the number of water molecules in a human body. You might know from chemistry that water has an atomic mass of 18 g/mole and that one mole is 6x1023 particles, which makes the inertia of a single water molecule 18x10-3 kg/(6x1023)= 310-26 kg. Alternativel ...
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Electromagnet



An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of a large number of closely spaced turns of wire that create the magnetic field. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.Electromagnets are widely used as components of other electrical devices, such as motors, generators, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.
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