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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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0.1 J
0.2 J
1 J
2 J

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detailed solution

Correct option is B

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

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