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← ScienceWhich outcome occurs when exceeding critical current in NbTi?
A)Abrupt return to normal resistance✓
B)Increased magnetic field penetration depth
C)Enhanced Cooper pair formation overall
D)Proportional incremental resistance increase
💡 Explanation
Exceeding the critical current causes an abrupt return to normal resistance because the superconductivity is achieved via the Meissner effect; a high current density surpasses the material's ability to maintain zero resistance by expelling magnetic fields, therefore resistance suddenly appears, rather than other gradual changes.
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