Physics

Problem

A magnetic dipole of moment

\boldsymbol{\mu}

is free to rotate in a uniform magnetic field

\mathbf{B}

. a. (i) At which angle

\theta

between

\boldsymbol{\mu}

and

\mathbf{B}

is its potential energy minimum? b. (ii) Is this orientation one of stable or unstable equilibrium? Give a brief reason.