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← ScienceWhich mechanism causes zero resistance below Tc in superconducting electromagnets?
A)Cooper pair formation via electron-phonon interaction✓
B)Increased electron-electron repulsion cancels resistance
C)Fermi level pinning eliminates scattering sites
D)Quantum entanglement bypasses lattice imperfections
💡 Explanation
Cooper pairs form because electron-phonon interactions mediate attraction, overriding Coulomb repulsion; therefore resistance drops to zero, rather than remaining finite as in normal conductors because of electron scattering.
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