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A current loop in a magnetic field
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- can be in equilibrium in one orientation
- can be in equilibrium in two orientations, both the equilibrium states are unstable
- can be in equilibrium in two orientations, one stable while the other is unstable
- experiences a torque whether the field is uniform or non-uniform in all orientations
Correct Option: C
A current loop in a magnetic field is in equilibrium in two orientations one is stable and another unstable.
τ = →M × →B = MB sin θ
If θ = 0° ⇒ τ = 0 (stable)
If θ = π ⇒ τ = 0 (unstable) 
Do not experience a torque in some orientations Hence option (c) is correct.
