Question

A ball of superconducting material is dipped in liquid nitrogen and placed near a bar magnet. (i) In which direction will it move? (ii) What will be the direction of it’s magnetic moment?

Answer 1

A superconducting material and nitrogen both are diamagnetic in nature. When diamagnetic material is dipped in liquid nitrogen, it again behaves as a diamagnetic material. Thus, superconducting material will again behave as a diamagnetic material. When this diamagnetic material is placed near a bar magnet, it will be feebly magnetised opposite to the direction of magnetising field.

1. So it will move away from the magnet.
2. Magnetic moment is from left to right and it is opposite to the direction of magnetic field.