A recent preprint appearing on the arxiv:
Do superconductors violate Lenz's law? Authors: J.E. Hirsch
When a magnetic field is turned on, a superconducting body acquires an angular momentum in direction opposite to the applied field. This gyromagnetic effect has been established experimentally and is understood theoretically. However, the corresponding situation when a superconductor is cooled in a pre-existent field has not been examined. We argue that the conventional theory of superconductivity does not allow a prediction for the outcome of that experiment that does not violate fundamental laws of physics, in particular Lenz's law. Instead, an unconventional theory of superconductivity predicts an outcome consistent with the laws of physics, through the creation of angular momentum. We discuss how to test these assertions experimentally.
Comments: Readers are invited to place a wager on the outcome of the proposed experiment, this http URL