In superconductivity, the electrical resistance of material becomes
a) zero
b) infinite
c) finite
d) unity
Correct Answer: Option A
Superconductivity - property of certain materials to conduct DC current without energy loss when they are cooled below certain temperature (critical temperature).
No energy loss means, $I^2\;R\;t=0$. Here, $I$ and $t$ can't be zero. Hence $R=0$
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