Question : Which of the following was the first theory of superconductivity?
Option 1: Ginzburg-Landau theory
Option 2: London theory
Option 3: Resonating valence bond theory
Option 4: Quantum field theory
Correct Answer: London theory
Solution : The correct answer is the London theory .
London theory was the first phenomenological explanation of superconductivity. It was proposed in 1935, not long after the brothers Fritz and Heinz London learned that superconductors emit magnetic fields. The Meissner effect, wherein a material exponentially expels all internal magnetic fields when it reaches the superconducting threshold, may be explained by the equations of this theory, which is a significant achievement.
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