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coil
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coil

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Article History

coil, in an electric circuit, one or more turns, usually roughly circular or cylindrical, of current-carrying wire designed to produce a magnetic field or to provide electrical resistance or inductance; in the latter case, a coil is also called a choke coil (see also inductance). A soft iron core placed within a coil produces an electromagnet. A cylindrical coil that moves a plunger within it by variations in the current through the coil is known as a solenoid (q.v.).