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Q.

A current loop in a magnetic field

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a

can be in equilibrium in one orientation

b

can be in equilibrium in two orientations both the equilibrium states are unstable

c

experiences a torque whether the field is uniform or non-uniform in all orientations

d

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

answer is C.

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Detailed Solution

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At equilibrium, net torque on the loop is zero as the net force is already zero on a loop in a uniform magnetic field.

τ→=M→×B→=0→

⇒θ=00 : stable equilibrium

and, θ=1800 : unstable equilibrium

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