A short bar magnet with its axis inclined at 30 degree to the external magnetic field of 800G acting horizontally experiences a torque of 0.016Nm. calculate the
a) the magnetic moment of the magnet.
b) the work done by an external force in moving it from most stable to most unstable position.
c) what is the work done by the force due to the external magnetic field in the process mentioned in (b).