Super conductivity is observed for

infrared frequencies

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d.c. and low frequency

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a.c. and high frequency

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frequencies having no effect

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Solution

The correct option is B d.c. and low frequency
The transmission loss of superconducting $D C$ (alternating current) power transmission is ten times less than that of superconducting $A C$ power transmission, thirty times less than the transmission loss of ordinary $A C$ power transmission.
Hence, that's why superconductivity is observed only for $D C$ and low frequency.

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