A bar magnet is hug by a thin cotton thr...

A bar magnet is hug by a thin cotton thread in a uniform horizontal magnetic field and is in equilibrium state the energy required to rotate it by `60^@` is W now the torque required to keep the magnet in this new position is

`(2W)/(sqrt3)`

`W/(sqrt3)`

`sqrt3W`

`(sqrt3W)/(2)`

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