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A bar magnet hung by a insulating thread...

A bar magnet hung by a insulating thread In a uniform horizontal magnetic field and magnet is in equilibrium Initially. The torque required to keep the magnet at angle by 30° with the direction of magnetic field is t. Then the work done to rotate it by same angle from initial position is

A

`(2-sqrt3)t`

B

`sqrt3t`

C

`t`

D

`(t(sqrt3+2))/2`

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