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Q.

When the north pole of a strong magnet is brought near to the north pole of a weak magnet then they will : 

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a

Attract each other

b

Repel each other

c

First, attract and then repel

d

First, repel and then attract

answer is A.

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Detailed Solution

  • As we know the like poles of a magnet repel each other, that's why the north pole of a strong magnet repels the weak pole of the weak magnet from distance.
  • But It attracts each other after it brought close together, It happens because of the phenomenon of magnetic induction.
  • According to this phenomenon, if any weak magnet is brought near the strong magnet, then strong magnets have a tendency to reverse the poles of the weaker magnets.
  • So, The north pole of the strong magnet induces a weak south pole on the weak magnet. That's why it attracts a weak magnet.
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When the north pole of a strong magnet is brought near to the north pole of a weak magnet then they will :