A magnetic needle is placed in a uniform...

A magnetic needle is placed in a uniform magnetic field and is aligned with the field. The needle is now rotated by an angle of `60^(@)` and the work done is W. The torque on the magnetic needle at this position is

`2sqrt3W`

`sqrt(3W)`

`(sqrt3)/(2)W`

`(sqrt3)/(4)W`

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