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Question

If a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is
  1. repelled by the north pole and attracted by the south pole
  2. repelled by both the poles
  3. attracted by both the poles
  4. attracted by the north pole and repelled by the south pole

A
repelled by the north pole and attracted by the south pole
B
attracted by both the poles
C
repelled by both the poles
D
attracted by the north pole and repelled by the south pole
Solution
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Diamagnetic materials create an induced magnetic field in a direction opposite to an externally applied magnetic field, and are repelled by the applied magnetic field. Hence, if a diamagnetic substance is brought near the north or the south pole of a bar magnet, it is repelled by the both the poles.

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