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Question:

A uniform magnetic field B of 0.3 T is along the positive Z-direction. A rectangular loop (abed) of sides 10cm × 5cm carries a current I of 12A. Out of the following different orientations which one corresponds to stable equilibrium?

Solution:

As we can see, the forces meet at a point. So, even if we turn the loop along any axis, the net torque will bring it back to its initial position. Hence it is in stable equilibrium.