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Q.

A magnet of magnetic moment 2J T-1 is aligned in the direction of magnetic field of 0.1 T. What is the net work done to bring the magnet normal to the magnetic field?

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a

0.1 J

b

0.2 J

c

1 J

d

2 J

answer is B.

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Detailed Solution

W = MB(1-cosθ) =2 x 0.1 x (1-cos90o) = 0.2J
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