A magnetic needle made of iron is suspended in a uniform external magnetic field. It experiences a torque and the needle starts oscillating. Write down the frequency of oscillation of the magnetic needle.

A magnetic needle kept in a non- uniform magnetic field, experiences (a)Force (b)Torque (c)Force and torque (d)None

When a magnetic needle is placed in a non-uniform magnetic field it experiences. State whether the potential energy of the magnet increases or decreases after rotation. Justify your answer.

A bar magnet of magnetic moment 1.5J//T lies .aligned with the direction of a uniform magnetic field of 0.22 T? What is the torque on the magnet if it is aligned opposite to the direction of magnetic field?