A magentic dipole in a constant magnetic field has

Options

A. 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.

Answer

c

Explanation

(c) Potential energy of dipole, `U= -pE cos theta`
Torque experienced by dipole `tau=pE sin theta`
Torque will be maximum `(tau_(max))` when `theta=90^(@)` then potential energy U=0