Class 7 Physics Electric Current and its Effects Electromagnet

Electromagnet

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current.

  • The magnetic field disappears when the current is turned off.
  • Electromagnets usually consist of a large number of closely spaced turns of wire or coilthat create the magnetic field.
  • The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron.
  • Advantage of an electromagnet over a permanent magnet is that the magnetic field is controllable (switching on/off electric current).
  • Disadvantage of an electromagnet over a permanent magnet is that it needs continuous supply.
  • Examples of Electromagnets used in day to day life are: Induction plate, electric bell, hard disk drives, Loudspeakers, Motors

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