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Q.

A bar Magnet of Magnetic Moment 3.0 amp.m2 is placed in a uniform Magnetic induction field 2x 10-5 T. If each pole of the magnet experience a force of 6x 10-4 N, the length of the magnet is

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a

0.5 m

b

0.3 m

c

0.2 m

d

0.1 m

answer is D.

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Detailed Solution

F = mB M = m×2l
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