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← ScienceWhich outcome results when a strong external magnetic field penetrates a SQUID magnetometer?
A)Flux trapping in superconducting loop✓
B)Increased Josephson junction oscillation
C)Reduced critical current through device
D)Elevated thermal noise within the coils
💡 Explanation
When a strong external field penetrates a SQUID magnetometer, the Meissner effect is overcome, causing magnetic flux to become trapped within the superconducting loop due to quantized fluxoid constraints. Therefore flux trapping results, rather than oscillation, reduced current, or thermal noise which involve fundamentally different effects.
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