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← ScienceWhich outcome occurs when external magnetic fields penetrate niobium-titanium wires?
A)Flux pinning prevents complete field expulsion✓
B)Critical temperature greatly increases steadily
C)Perfect diamagnetism excludes magnetic field
D)Cooper pairs spontaneously dissociate readily
💡 Explanation
Flux pinning occurs preventing complete Meissner effect, because magnetic fields enter material as quantized fluxons. Therefore, complete field expulsion is hindered, rather than perfect diamagnetism persisting under a critical field.
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