(a) What happens to the electrical resistance when mercury is cooled to 4.12 K?
(b) What name is given to this phenomenon?
(a) When mercury is cooled to 4.12 K, the electrical resistance of mercury disappears completely and becomes zero.
(b) This phenomenon of loss of electrical resistance of a substance on cooling it to an extremely low temperature is known as superconductivity.
(b) This phenomenon of loss of electrical resistance of a substance on cooling it to an extremely low temperature is known as superconductivity.
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