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← ScienceWhich outcome results when current density exceeds critical levels in a superconducting cable?
A)Abrikosov vortices become increasingly mobile✓
B)Cooper pair formation rate accelerates
C)Phonon-mediated attraction becomes dominant
D)Magnetic field lines efficiently expelled
💡 Explanation
Exceeding critical current density enables magnetic field penetration, because the Lorentz force overcomes the superconducting state's Cooper pair binding energy. This generates mobile Abrikosov vortices, therefore, resistance emerges rather than remaining field expulsion under the Meissner effect.
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