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Q.

When a current carrying coil is placed in a uniform magnetic field with its magnetic moment anti – parallel to the field.

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a

Potential energy is maximum.

b

Dipole is in unstable equilibrium.

c

Torque on it is maximum.

d

Torque on it is zero.

answer is B, C, D.

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Detailed Solution

detailed_solution_thumbnail

$\vec{τ} = \vec{M} \times \vec{B}$ and $U = - \vec{M} . \vec{B}$

$\vec{M}$ and $\vec{B}$ are anti parallel,

∴ $\vec{T} =$ 0 and $U = + M B$ (maximum).

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