An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the center of the coil. The magnetic field disappears when the current is turned off. 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.
invented by Zenobe Gramme
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invented by Edmond Becquerel
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invented by Francis Ronalds
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invented by richard trevithick
A steam locomotive is a rail vehicle that provides the force to move itself and…
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