I take it that it would be ok that in the classic demonstration of Lenz's law with the falling magnet, to replace the magnet with some quantum particle of non-zero magnetic moment and make the tubing a solenoid in order to generate a current as the particle fell? Obviously the current would be miniscule, given the small moment and particle size; I'm just making sure that I have the general idea right first. p.s. Would this be the right sub-forum for this? Or would it belong in the particle or even classical physics section?