A bar magnet having a magnetic movement of 2 10 4 JT -1 is free to rotate in a horizontal plane. A horizontal magnetic field B =6 10 -4 T exists in the space. The work done in taking the magnet slowly from a direction parallel to the field to a direction 60 from the field is :

1. A. 2 J
2. B. 0.6 J
3. C. 12 J
4. D. 6 J

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