Q .     A bar magnet is hung by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state. the energy required to rotate it by `60^o` is W, Now the torque required to keep the magnet in this new position is.

NEET 2016
A

`\frac{2W}{\sqrt{3}}`

B

`\frac{W}{\sqrt{3}}`

C

`\sqrt{3} W`

D

`\frac{\sqrt{3}}{2} W`

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