A short bar magnet of magnetic moment `0.32JT^(-1)` is placed in a uniform magnetic field 0.15T. If the bar magnet is free to rotate in the plane of the field, which orientation would corespond to its (i) stable and (ii) unstable equilirium? What is the potential energy of the magnet in each case?

Options

A. `-4.8 xx 10^(-2) J , 4.8 xx 10^(-2 )J`
B. `-4.2 xx 10^(-2) , + 4.8 xx 10 ^(-3) J`
C. `+ 4.2 xx 10^(-2) J , -2.8 xx 10^(-3) J`
D. `+4.8 xx 10^(-2) J , -2.8 xx 10^(-3) J`