Solve this multiple-choice question and choose the correct option.

Low-temperature physics: What defines a superconductor? Choose the most accurate description of electrical and magnetic behavior below a critical temperature T<sub>c</sub>. Choose the correct option.

Difficulty: Easy

Infinite resistance and perfect diamagnetism
Zero electrical resistance and Meissner effect (expulsion of magnetic field) below T_c
Very high resistivity that decreases slowly with temperature
Becomes a ferromagnet below T_c

Correct Answer: Zero electrical resistance and Meissner effect (expulsion of magnetic field) below T_c

Explanation:

DefinitionA superconductor exhibits zero DC resistance and expels magnetic fields (Meissner effect) below its critical temperature.

Final AnswerZero electrical resistance and Meissner effect (expulsion of magnetic field) below T_c

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