Why superconductors at very low temperatures have tremendous applications if used in applications?

Due to nearly zero resistance, current decays very fast in superconductor without applying any voltage across it.

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Due to nearly zero resistance, current persists in superconductor for a long time without applying any voltage across it.

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Due to nearly zero conductance, current persists in superconductor for a long time without applying any voltage across it.

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Due to nearly zero resistance, it is practically unaffected by temperature.

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Solution

The correct option is B Due to nearly zero resistance, current persists in superconductor for a long time without applying any voltage across it.
Due to nearly zero resistance, constant current persists in superconductors with practically no source. This reduces power consumption drastically. Also, dimensions of the conductor can be reduced to very small volume and this gives very efficient and compact equipment. Hence current option is B.

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