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

`0.6 J`

`12 J`

`6 J`

`2 J`

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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

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