Question

Measured using an Electrical Conductivity meter, what is the order of resistivity of superconducting materials?

(a) 10^-8

(b) 10^16

(c) ∞

(d) 0

I have been asked this question in an interview for job.

My question is based upon Electrical Properties in division Properties of Engineering Materials of Engineering Material & Metallurgy

Answer 1

Correct option is (d) 0

To elaborate: The resistivity of superconducting materials is 0 since they conduct all electricity and resist none of it. Metals have the resistivity of the order of 10^-8 while that of insulators is of the order of 10^16. Since maximum electricity is refused by super-insulators, their resistivity is ∞.