Electromagnet Diagram

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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 in 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.