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← ScienceWhich mechanism causes zero resistance in superconducting Josephson junctions?
A)Flux quantization enables Cooper pair tunneling✓
B)Increased phonon coupling lowers resistance
C)Enhanced electron-phonon scattering raises Tc
D)Magnetic field domains block current flow
💡 Explanation
Flux quantization causes zero resistance because specific quantized magnetic flux levels enable lossless Cooper pair tunneling across the insulating barrier; therefore current flows without dissipation, rather than resistance impeding current through scattering mechanisms.
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