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← ScienceWhich mechanism causes perfect diamagnetism in superconductors during cooling?
A)Meissner effect expels flux✓
B)Vortex pinning limits flux
C)Critical current generates field
D)Thermal gradients distort flux
💡 Explanation
The Meissner effect causes perfect diamagnetism in superconductors upon cooling because it expels all magnetic fields from the material; therefore, there is no internal magnetic field to counteract the external field, rather than gradual reduction seen in normal conductors.
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