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Mention the differences between an electromagnet and a permanent magnet.

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Mention the differences between an electromagnet and a permanent magnet.

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Electromagnet

  • It is temporary magnet and can be demagnetized.

  • Magnetic strength can be changed.

  • Its polarity can also be changed.

  • It is prepared from soft iron.

Permanent magnet

  • It is a permanent magnet and cannot be demagnetized easily.

  • Its strength is fixed.

  • Its polarity is fixed.

  • It is prepared from hard steel.

 

गैल्वेनोमीटर किसे कहते है? What is a galvanometer? 

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