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Q.

A short magnet placed with its axis making an angle with a uniform external magnetic field of induction B experiences a torque (τ) . If the magnet is free to rotate, which orientation would correspond to its stable and unstable equilibrium.

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a

θ=00,  θ=900

b

θ=00,  θ=180°

c

θ=45°,  θ=1350

d

θ=0°,θ=270°

answer is B.

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Detailed Solution

In stable equlibrium PE is minimum and in unstable equilibrium PE is maximum and τ is zero in both cases
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