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A current loop in a magnetic field:
A
Can be in equilibrium in two orientations, one stable while the other is unstable
B
Experiences a torque whether the field is uniform or non uniform in all orientations
C
Can be in equilibrium in one orientation
D
Can be in equilibrium in two orientations, both the equilibrium states are unstable
Detailed Solution
The potential energy of the loop is $U = -MB\cos\theta$.
It is in equilibrium when $\vec M$ is parallel to $\vec B$ ($\theta = 0^\circ$, stable) and when it is antiparallel ($\theta = 180^\circ$, unstable).
It is in equilibrium when $\vec M$ is parallel to $\vec B$ ($\theta = 0^\circ$, stable) and when it is antiparallel ($\theta = 180^\circ$, unstable).