Q. Superconductivity is a phenomenon by which the resistance of a substance:

A
Increases with temperature
B
Decreases with pressure
C
Becomes zero at low pressure
D
Becomes zero at very low temperature
Solution:

Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic flux fields occurring in certain materials, called superconductors, when cooled below a characteristic critical temperature. It was discovered by Dutch physicist Heike Kamerlingh Onnes on April 8, 1911, in Leiden.

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