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← ScienceWhich mechanism causes perfect conductivity in a solenoid cooled below its critical temperature?
A)Meissner effect expelling magnetic fields✓
B)Ohmic resistance increasing significantly
C)Formation of Cooper pair insulation
D)Increased electron-phonon scattering weakening supercurrent
💡 Explanation
The Meissner effect causes perfect conductivity because a superconductor expels all magnetic fields, thereby preventing flux penetration and resistance arising from eddy current losses; therefore, the solenoid exhibits superconductivity rather than retaining some residual resistance.
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