Question

Derive an expression for the torque on a magnetic dipole placed in a magnetic field and hence define magnetic dipole moment.

Answer 1

Answer:These two forces are equal and opposite, hence constitute a couple. The direction of τ is perpendicular to the plane containing Vec M and Vec B. Hence, moment of the magnet M is equal to the torque necessary tokeep the magnet at right angles to a magnetic field of unit magnetic induction.

Explanation:

Answer 2

Answer:

Answer:These two forces are equal and opposite, hence constitute a couple. The direction of τ is perpendicular to the plane containing Vec M and Vec B. Hence, moment of the magnet M is equal to the torque necessary tokeep the magnet at right angles to a magnetic field of unit magnetic induction. ·