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A bar magnet having a magnetic moment of...

A bar magnet having a magnetic moment of `2 xx l0 ^4 JT^-1` is free to rotate in a horizontal plane. A horizontal magnetic field `B = 6 xx 10^-4 T` exits 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:

A

12 J

B

6 J

C

2 J

D

0.6 J

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