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Which outcome results in a superconducting coil when persistent current experiences a slowly increasing external flux bias?

A)Flux pinning prevents flux penetration
B)Global temperature uniformly increases
C)Coil inductance changes momentarily
D)Critical current density approaches zero

💡 Explanation

Flux pinning prevents additional flux penetration because the Meissner effect expels any induced flux, therefore the existing current redistributes to maintain zero net magnetic flux rather than allowing fluxons to penetrate and dissipate energy.

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