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← ScienceWhich mechanism causes the Meissner effect when superconducting?
A)Complete magnetic field expulsion✓
B)Increased isotope critical temperature
C)Increased thermal conductivity only
D)Phonon-mediated electron tunneling
💡 Explanation
Complete magnetic field expulsion during superconductivity results from the Meissner effect and is caused by perfect diamagnetism, because currents at the surface cancel external fields, therefore the magnetic field is excluded, rather than partially penetrating the material.
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