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Materials having resistance almost equal to zero is _______(a) Semi-conductor(b) Conductor(c) Superconductors(d) InsulatorsThis question was posed to me at a job interview.Question is from Temperature Coefficient of Resistance topic in chapter Simple DC Networks of Basic Electrical Engineering

Answer»

The correct choice is (C) Superconductors

For explanation I would say: When the temperature of the MATERIAL falls to absolute ZERO, the RESISTANCE falls to zero and hence there are no I^2R losses. Since resistance is zero, conductance is almost infinity and hence these MATERIALS are known as superconductors.



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