Drive an expression of Potential energy of a bar magnet in a uniform magnetic field.

Explain magnetic dipole moment of a revolving electron.

Describe the motion of a charged particle in a uniform magnetic field.

Deduce the expression for the torque \(\vec { \tau } \) when \(\hat { n } \) unit vector n is at an angle 8 with the field.

Two long and parallel street wires carrying current of 2A and 5A in the opposite direction are separated by a distance of 1 cm, Find the nature and magnitude of the magnetic force between them.