Question

The figure shows two diamagnetic spheres locate near the South Pole of a bar magnet. Then

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

Answer 1

Answer: (B), (D)

The correct options are
B The force on sphere $2$ is directed away from the magnet
D The magnetic dipole moment of the sphere $2$ is directed away from the magnet

Since spheres $1$ and $2$ are diamagnetic, so force $\overrightarrow{F_1}$ and $\overrightarrow{F_2}$ on both the spheres will be in opposite direction to the external field


Suppose the dipole moment for sphere be $M$.


$\because F_{-m}>F_{+M}\Rightarrow F_{net}$ towards right

$\therefore$ Magnetic dipole moment of sphere $2$ is towards right.

Hence, $\left(B\right)$ and $\left(D\right)$ are correct options.