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(D) When a current loop is placed in a magnetic field,it experiences a torque given by $\vec{	au} = \vec{M} 	imes \vec{B}$,where $\vec{M}$ is the ma

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

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(D) When a current loop is placed in a magnetic field,it experiences a torque given by $\vec{	au} = \vec{M} 	imes \vec{B}$,where $\vec{M}$ is the magnetic moment and $\vec{B}$ is the magnetic field.The magnitude of the torque is $	au = MB \sin 	heta$,where $	heta$ is the angle between $\vec{M}$ and $\vec{B}$.Equilibrium occurs when the torque is zero,which happens when $\sin 	heta = 0$,i.e.,$	heta = 0^{\circ}$ or $	heta = 180^{\circ}$.$1$. When $	heta = 0^{\circ}$,$\vec{M}$ and $\vec{B}$ are parallel. This is a state of minimum potential energy $(U = -\vec{M} \cdot \vec{B} = -MB)$,which corresponds to stable equilibrium.$2$. When $	heta = 180^{\circ}$,$\vec{M}$ and $\vec{B}$ are antiparallel. This is a state of maximum potential energy $(U = +MB)$,which corresponds to unstable equilibrium.Thus,the loop can be in equilibrium in two orientations,one stable and one unstable.

$A$ current loop in a magnetic field:

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