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positively charged - Colorado Mesa University
positively charged - Colorado Mesa University

... Which of the following is true? 1. The magnitude of the force exerted on a charge at P is always larger than that exerted on another charge at Q. 2. The magnitude of the force exerted on a charge at P is always smaller than that exerted on another charge at Q. 3. The magnitude of the force exerted o ...
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... include crystal lattice distortions, electronic inhomogeneities or chemical redistribution. A deeper knowledge in this field is thus necessary to obtain fully functional oxide devices. Spintronics is the new electronics which exploits not only the charge but also the spin character of the carriers i ...
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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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