McqMate
| Q. |
Which of the following was the first theory of super conductivity? |
| A. | Ginzburg Landau theory |
| B. | London theory |
| C. | Resonating valence bond theory |
| D. | Quantum field theory |
| Answer» B. London theory | |
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Explanation: The first phenomenological theory of superconductivity was London theory. It was put forward by the brothers Fritz and Heinz London in 1935, shortly after the discovery that magnetic fields are expelled from superconductors. A major triumph of the equations of this theory is their ability to explain the Meissner effect, wherein a material exponentially expels all internal magnetic fields as it crosses the superconducting threshold. |
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