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