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A bar magnet having a magnetic moment of...

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

A

0.6 j

B

2 j

C

6 j

D

12 J

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MODERN PUBLICATION-TEXTUAL QUESTIONS-EXERCISE
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