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← ScienceWhich mechanism causes persistent currents within superconducting toroidal magnets?
A)Meissner effect expelling magnetic fields
B)Flux pinning preventing magnetic movement
C)Cooper pair formation reducing resistance✓
D)Quantum tunneling through thin barriers
💡 Explanation
Persistent currents arise because Cooper pair formation allows electrons to move without resistance. Superconductivity eliminates scattering events; therefore current continues indefinitely, rather than diminishing due to collisions with the lattice or impurities as in normal conductors.
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