1.

.Ashortbar-magnetofmagneticmomentm0.32JT-1is free to rotate in the plane of a uniform externalmagnetic field B of 0.15 T What orientations ofthe magnet would correspond to its (i) stable and(ii) unstable equilibrium? What is the potential energyof the magnet in the magnetiç field in each case?Ans. (i) m parallel to B, Um B0.048 J(ii) m anti-parallel to B; U +m B +0.048 J.2

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