A) can be a equilibrium in two orientations, both the equilibrium states are unstable
B) can be in equilibrium in two orientations, one stable while the other is unstable
C) experiences a torque whether the field is uniform or non uniform in all orientations
D) can be in equilibrium in one orientation
Correct Answer: B
Solution :
(b) can be in equilibrium in two orientations, one stable while the other is unstable When a current loop is placed in a magnetic field it experiences a torque, it is given by \[\overrightarrow{\tau }=\overrightarrow{M}\times \overrightarrow{B}\] where \[\overrightarrow{M}\]is the magnetic moment of the loop and \[\overrightarrow{B}\]is the magnetic field. or \[\tau =MB\,\sin \,\theta \] where \[\theta \] is angle between M and B When \[\overrightarrow{M}\] and \[\overrightarrow{B}\] are parallel (i.e.. \[\theta =0{}^\circ \]) the equilibrium is stable and when they are antiparallel (i.e., \[\theta =\pi \]) the equilibrium is unstable.
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