NEET 2009 Physics question

Not in JEE Advanced syllabus

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)attracted by the north pole and repelled by the south pole
(3)attracted by both the poles
(4)repelled by both the polesCorrect

Answer: (4)

Solution

A diamagnetic substance gets weakly magnetised in a direction opposite to the applied field (induced pole facing the nearer magnet pole is of the same kind). Therefore the induced pole nearest to either pole of the magnet is of the same polarity as that pole and is

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Question ID VK-090168