Question

A rod of diamagnetic material is placed between the north and south poles of two magnets, such that the length of the rod is aligned with the direction of the magnetic field. The rod is free to rotate. Then -

• A. The rod will remain in equilibrium in its initial position
• B. The rod will attain equilibrium in a position where its final position makes an angle of ${180}^{\circ }$ with its initial position
• C. The rod will attain equilibrium in a position where its final position makes an angle of ${90}^{\circ }$ with its initial position
• D. The rod will attain equilibrium in a position where its final position makes an angle of ${45}^{\circ }$ with its initial position

Answer 1

The correct option is C The rod will attain equilibrium in a position where its final position makes an angle of ${90}^{\circ }$ with its initial position

Freely suspended diamagnetic material in a magnetic field aligned itself perpendicular to the field.

Hence, the rod will attain equilibrium in a position where its final position makes an angle of ${90}^{\circ }$ with its initial position.

Therefore, option $\left(C\right)$ is correct.