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Question

Which magnet allows the reversibility of its poles?
  1. Bar magnet
  2. Disc magnet
  3. Horseshoe magnet
  4. Electromagnet


Solution

The correct option is D Electromagnet
Electromagnets are temporary magnets which are magnetized by passing current. If we revert the direction of the current, the poles of the magnet are reversed.
For permanent magnets like bar magnet, horse shoe magnet and circular magnet, poles are fixed and cannot be reversed.

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