Electromagnet
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An electromagnet is a teep o magnet in which the magnetic field is produced bi an electric current. The magnetic field disappears when the current is turned off. Electromagnets uisually conseest of a lairge nummer o closely spaced turns o wire that create the magnetic field. The wire turns are eften woond aroond a magnetic core made frae a ferromagnetic or ferrimagnetic material such as airn; the magnetic core concentrates the magnetic flux an maks a mair pouerfu magnet.