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Comment Re:Two hits in the efficiency chain? (Score 1) 246

By Lenz's Law, the only way that you can get a magnetic field from electric current is to have a current input varying in the time domain (AC).

It's the other way around. The only way you can get electric current from a magnetic field is to have the field input varying in the time domain.

Otherwise how would my MRI magnets produce a magnetic field? (DC current is "stored" on the superconducting coil inside them)

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