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Question

The work done in rotating a magnet of magnetic moment 2 Am2 in a magnetic field of 5×103 T from the direction along the magnetic field to opposite direction to the magnetic field, is

A
Zero
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B
2×102 J
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C
102 J
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D
10 J
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Solution

The correct option is B 2×102 J
W=MB(1cos θ); where θ=180
W=2MBW=2×2×5×103=2×102 J

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