Question

When does a diamagnetic material become normal material?

(a) At critical temperature

(b) Above critical temperature

(c) Never

(d) Below critical temperature

This question was addressed to me in an interview for job.

The query is from Classification of Magnetic Materials in section Magnetic Properties of Materials of Engineering Physics II

Answer 1

Correct choice is (d) Below critical temperature

For explanation I would say: Critical temperature is the temperature at which properties like magnetism changes. When the temperature is less than the critical temperature, diamagnetic material becomes a normal magnet.