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← ScienceWhich mechanism limits current density in superconducting wires?
A)Flux pinning quenches superconductivity locally✓
B)Thermal expansion weakens critical temperature
C)Increased resistance from phonon scattering
D)Crystal defects interfere Cooper pairing
💡 Explanation
Flux pinning limits supercurrent because the Lorentz force unbinds pinned vortices, causing energy dissipation and normal conductivity; therefore, superconductivity collapses locally rather than thermal mechanisms triggering total loss.
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