NEET 2013 Physics question

A current loop in a magnetic field -

(1)experiences a torque whether the field is uniform or non-uniform in all orientations
(2)can be in equilibrium in one orientation
(3)can be in equilibrium in two orientations, both the equilibrium states are unstable
(4)can be in equilibrium in two orientations, one stable while the other is unstableCorrect

Answer: (4)

Solution

A current loop is a magnetic dipole of moment , and in a uniform field it experiences a torque , with . The torque vanishes (equilibrium) at ( parallel to ) and at (

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Question ID VK-091323