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Question

The polarity of a …………… (permanent/temporary) magnet cannot be changed.


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Solution

  1. Magnets that can not lose their magnetic property once they are magnetized is called a permanent magnet.
  2. The (north-south) polarity of a permanent magnet is fixed and cannot be changed.
  3. The polarity of an electromagnet can be changed by changing the direction of the current in its coil.

Hence, The polarity of a permanent magnet cannot be changed.


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