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The Barnett Experiment with a Rotating Solenoid Magnet

This problem is based on an experiment by Barnett [1] that was meant to address the question of whether the magnetic field lines of a solenoid magnet rotate when the magnet rotates about its axis. See also [2]. It will also illustrate a remark by Schiff [3] that care must be taken when discussing electrodynamics in rotating frames, because the effect of the “distant stars” is to introduce “fictitious” charges and currents into the problem.