ELECTROMAGNETS [Induction Apparatus]

ELECTROMAGNETS [Induction Apparatus]

(Wikipedia excerpt: ..."...An electromagnet [E] is a type of magnet in which the magnetic field is produced by an electric current. [E] usually consist of wire (likely copper) wound into a coil. A current through the wire creates a magnetic field which is concentrated along 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.

The main advantage of an [E] over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet, which needs no power, an [E]requires a continuous supply of current to maintain the magnetic field. ..")

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