Question

For a dielectric which of the following properties hold good?

(a) They are superconductors at high temperatures

(b) They are superconductors at low temperatures

(c) They can never become a superconductor

(d) They have very less dielectric breakdown voltage

This question was addressed to me in exam.

My doubt is from Dielectrics in division Electric Fields in Material Space of Electromagnetic Theory

Answer 1

The correct answer is (b) They are superconductors at low temperatures

Explanation: Superconductors are characterised by diamagnetism behaviour and zero resistivity, which true for a dielectric. They occur only at low temperature. Thus a dielectric can become a superconductor at low temperatures with very high dielectric breakdown voltage.