Fred2718 t1_ja6gl6v wrote
There actually is a device that many people have used, which uses a perpetual motion machine as a very important part. Many MRI or NMR machines contain a powerful electromagnet built with superconducting wires. Once you get the current in the wires running, and the magnetic field built up, you disconnect the power source and the current keeps going, forever. (Or until you shut it down for maintenance, or there's a quench failure.)
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