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Inside a superconductor, the valence electrons are free to move -- so free, in fact, that in the aggregate they behave like a superfluid, not subject to friction. As a consequence, during rotation of the superconductor around an axis of symmetry, the electrons stay still while the positively charged atoms move. By Ampère's law (moving charges create a magnetic field) a magnetic field results. This magnetic field is called a London field.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "London_field". A list of authors is available in Wikipedia.|