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Question

A magnet of magnetic moment 2JT1 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

A
0.1 J
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B
0.2 J
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C
1 J
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D
2 J
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Solution

The correct option is B 0.2 J
W=MB(1cos θ)=2×0.1×(1cos 90)=0.2 J

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