question_answer

  Distinguish between a permanent magnet and an electromagnet.

Answer:

                  The differences between a permanent magnet and an electromagnet are                                  

S. No.	Permanent magnet	Electromagnet
(i)	Its magnetic field is weak.	Its magnetic field is strong and variable.
(ii)	Magnetic properties are ever existing.	Magnetic properties are retained only till electric current is passing.
(iii)	N-S polarity is fixed.	N-S polarity can be reversed by reversing the direction of electric current.

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