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← ScienceWhich mechanism initiates persistent current flow once a superconducting loop closes?
A)Meissner effect expels ambient magnetic fields✓
B)Zero resistance maintains trapped magnetic flux
C)Flux pinning prevents magnetic field motion
D)Quantum tunneling bypasses residual resistance
💡 Explanation
The Meissner Effect expels magnetic fields, creating super currents at the surface. Because these dissipate energy, persistent circulating currents arise to cancel flux, therefore the Meissner effect starts flow rather than flux trapping via pinned vortices.
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