MHT CET Physics question

A current loop in a magnetic field [MHTCET 2013]

(A)experiences a torque whether the field is uniform or non-uniform in all orientations
(B)can be in equilibrium in one orientations
(C)can be in equilibrium in two orientations, both the equilibrium states are unstable
(D)can be in equilibrium in two orientations, one stable while the other is unstableCorrect

Answer: (D)

Solution

Torque vanishes when the loop's moment is parallel (stable equilibrium) or antiparallel (unstable equilibrium) to the field, so it is not

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Question ID VK-078850