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# A current loop with a current I is placed in a magnetic field B , the potential energy will not depend upon:orientation of loop with respect to direction of magnetic field.alignment of magnetic moment.current in the loop.material of the wire.

A
orientation of loop with respect to direction of magnetic field.
B
material of the wire.
C
alignment of magnetic moment.
D
current in the loop.
Solution
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#### For the current loop ABCD in magnetic field →BLet current flowing = IArea enclosed = A and μ = magnetic dipole moment.Now torque expressionτ=μ×Bextτ=μBextsinθThus potential energy,U=∫τdθ=∫μBsinθdθU=μBcosθAs U=IAB sinceThus U depends on i) orientation (θ)ii) Alignment of magnetic moment (μ)iii) Current = I

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