Question

How is an electromagnet made? Name two factors on which the strength of the magnetic field of an electromagnet depends.

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Answer

An electromagnet can be made in the following two shapes:

  1. I-shape or bar magnet.
  2. U-shape or horse-shoe magnet.

The principle behind making both the magnets is the same. An electromagnet can be made by winding an insulated copper wire over a piece of soft iron in U-shape or a solenoid.

The factors on which the strength of the magnetic field of an electromagnet depends are —

  1. The number of turns of wire wound around the coil — By increasing the number of turns of wire wound around the coil, the magnetic field of an electromagnet can be increased.
  2. The amount of current flowing through the wire — By increasing the current through the wire, the magnetic field of an electromagnet can be increased.

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