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A short bar magnet of magnetic moment m=...

A short bar magnet of magnetic moment `m= 0.32JT^-1` is placed in a uniform extemal magnetic field of 0.15T. If the bar is free to rotate in the plane of the field, which orientations would correspond to its (i) stable and (ii) unstable equilibrium? What is the potential energy of the magnet in each case?

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