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A bar magnet has a magnetic moment of 20...

A bar magnet has a magnetic moment of 200 `A.m^(2)`. The magnet is suspended in a magnetic field of `0.30NA^(-1)m^(-1)`. The torque required to rotate the magnet from its equilibrium position through an angle of `30^(@)`, will be

A

30Nm

B

`30 sqrt3Nm`

C

60N m

D

`60 sqrt3Nm`

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