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A bar magnetic having a magnetic moment of 2.0 × 10 5 JT –1 , is placed along the direction of uniform magnetic field of magnitude B = 14 × 10 –5 T. The work done in rotating the magnet slowly through 60° from the direction of field is:

1. 14 J
2. 8.4 J
3. 4 J
4. 1.4 J

Correct answer: 14 J

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