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A bar magnet having a magnetic moment of...

A bar magnet having a magnetic moment of `2xx10^(4) JT^(-1)` is free to rotate in a horizontal plane. A horizontal magnetic field `B=6xx10^(-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

2 J

B

`0.6 J`

C

`12 J `

D

`6 J`

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The correct Answer is:
D
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AAKASH INSTITUTE ENGLISH-MAGNETISM AND MATTER -ASSIGNMENT (SECTION C)
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