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Which mechanism causes lossless current when applying voltage?

A)Cooper pair formation via phonon exchange
B)Avalanche breakdown caused by impact ionization
C)Thermal runaway from extreme joule heating
D)Piezoelectric voltage generating high emf

💡 Explanation

Cooper pair formation allows current due to zero resistance below Tc, because electrons form correlated pairs at critical temperature, which is the London equations’ explanation for superconductivity; therefore, lossless current appears rather than resistance caused by electron scattering.

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