If a material in a superconducting state exceeds which three critical parameters, will it immediately revert to its normal, resistive state?
Answer
Critical temperature ($T_c$), critical current density ($J_c$), and critical magnetic field ($H_c$).
Superconductivity vanishes if the material temperature rises above $T_c$, if the applied current density exceeds $J_c$, or if the external magnetic field strength goes beyond $H_c$.
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