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Originally posted by Count Iblis II:
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You gave the answer that you will find in all textbooks right up to the present
Not true at all! Go to the library and read this book:

G. Rickayzen, Theory of Superconductivity (Interscience Publishers, New York, 1965).

You have to distingiush between rigorous theory and what is taught in high school and the first few years in university. The book by Rickayzen gives a rigorous derivation of the Meissner effects starting from BCS theory.
I am NOT talking about the Meissner effect here. That is a different issue that I am willing to deal with on another occasion. Do not advise me to read a book if you are not mentally capable of providing the answer yourself. Feynman stated clearly that the charge carriers react to an electric field. Do you agree or not?

By the way BCS is a misnomer; it should have been called BS theory!