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← ScienceWhich characteristic appears during electrical transition phase due to Cooper pairing?
A)Perfect diamagnetism (Meissner effect)✓
B)Increased electrical resistance noticeably
C)Increased thermal vibration significantly
D)Reduced electron-phonon interaction weakly
💡 Explanation
Perfect diamagnetism via the Meissner effect demonstrates superconductivity because persistent currents flow, creating a magnetic field that opposes external flux; therefore, magnetic field expulsion happens rather than merely improving conductivity, since resistance drops fully to zero.
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