solenoid

English Thesaurus

1. a coil of wire around an iron core; becomes a magnet when current passes through the coil (noun.artifact)

hypernym	:	coil,
definition	:	reactor consisting of a spiral of insulated wire that introduces inductance into a circuit (noun.artifact)

hypernym	:	magnet,
definition	:	(physics) a device that attracts iron and produces a magnetic field (noun.artifact)