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A bar magnet of magnetic moment 1.5 JT^(...

A bar magnet of magnetic moment `1.5 JT^(-1)` lies aligned with the direction of a uniform magnetic field of 0.22 T.
(a) What is the amount of work required by an external torque to turn the magnet so as to align its magnetic moment: (i) normal to the field direction (ii) opposite to the field direction?
(b) What is the torque on the magnet in cases (i) and (ii)?

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