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← ScienceWhich mechanism enables current bypass in superconducting magnets?
A)Flux pinning by defects✓
B)Tunneling across grain boundaries
C)Thermal excitation of quasiparticles
D)Vortex motion in impure regions
💡 Explanation
Flux pinning by defects is a fundamental mechanism for superconductivity; defects stabilize the magnetic flux lines, because these lines are pinned; therefore current bypasses resistive regions, rather than losses within a pure superconductor.
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