Find expression for work done in rotating a bar magnet in a uniform magnetic field.

Derive an expression for torque acting on a bar magnet placed in a uniform magnetic field.

Derive an expression for Torque acting on a bar magnet placed in a uniform magnetic field.

Derive an expression for potenstial energy of bar magnet in a uniform magnetic field.

Derive an expression for a torque acting on a bar magnet placed in uniform magnetic field B.

Derive an expression for potential energy of a bar magnet, when placed uniform magnetic field. When it is maximum and minimum?