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← ScienceWhich 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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