(C) The potential energy $U$ of a magnetic dipole in a magnetic field is given by $U = -mB \cos \theta$,where $m$ is the magnetic moment and $B$ is th

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zero potential energy when the torque is maximum

(C) The potential energy $U$ of a magnetic dipole in a magnetic field is given by $U = -mB \cos \theta$,where $m$ is the magnetic moment and $B$ is the magnetic field.The torque $\tau$ experienced by the dipole is given by $\tau = mB \sin \theta$.For the torque to be maximum,$\sin \theta$ must be $1$,which occurs at $\theta = 90^{\circ}$.Substituting $\theta = 90^{\circ}$ into the potential energy equation: $U = -mB \cos(90^{\circ}) = -mB(0) = 0$.Therefore,the potential energy is zero when the torque is maximum.

Class 12 Physics Magnetism and Matter Magnetic field due to magnetic dipole and Dipole in Magnetic Field and Poential Energy and Work Done

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$A$ magnetic dipole in a constant magnetic field has

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maximum potential energy when the torque is maximum
B
zero potential energy when the torque is minimum
C
zero potential energy when the torque is maximum
D
minimum potential energy when the torque is maximum.

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Magnetic field due to magnetic dipole and Dipole in Magnetic Field and Poential Energy and Work Done

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$A$ magnetic dipole in a constant magnetic field has

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