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A current loop in a magnetic field

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can be in equilibrium in one orientation

can be in equilibrium in two orientations both the equilibrium states are unstable

can be in equilibrium in two orientations, one stable while the other is unstable

experiences a torque whether the field is uniform or non-uniform in all orientations

answer is C.

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Detailed Solution

At equilibrium, net torque on the loop is zero as the net force is already zero on a loop in a uniform magnetic field.

$\vec{τ} = \vec{M} \times \vec{B} = \vec{0}$

$\Rightarrow θ = 0^{0} : stable equilibrium$

$and, θ = 180^{0} : unstable equilibrium$

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