what do you mean by soleniod
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A solenoid is a coil of insulated or enameled wire wound on a rod-shaped form made of solid iron, solid steel, or powdered iron. Devices of this kind can be used as electromagnets, as inductors in electronic circuits, and as miniature wireless receiving antennas.
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A long straight coil of wire can be used to generate a nearly uniform magnetic field similar to that of a bar magnet.
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