Question

The figure shows two diamagnetic spheres located near the south pole of a bar magnet. Then

• A. The force on sphere $1$ is directed towards the magnet.
• B. The magnetic dipole moment of sphere $1$ is directed towards the magnet.
• C. The force on sphere $2$ is directed away from the magnet.
• D. The magnetic dipole moment of sphere $2$ is directed towards from the magnet.

Answer 1

The correct option is C The force on sphere $2$ is directed away from the magnet.

Diamagnetic material gets repelled by the magnet, so both the spheres will be repelled by the magnet. The force between the spheres is very small as compared to the forces $F_{s1}$ and $F_{s2}$ between the sphere and the magnet, so it can be neglected.


Since, the sphere is repelled by the magnet, so the face of the sphere facing the south pole will act as the South Pole and the opposite face of the sphere will act as the North Pole.

As the dipole moment of a magnet is always directed from south pole to north pole, so the dipole moment of both spheres will be directed away from the magnet.

Hence, option $\left(C\right)$ is the correct answer.