John Hopkinson became famous through his theoretical en practical work on the application of electricity and magnetism in devices like a dynamo and electromagnets. [1] (http://www-g.eng.cam.ac.uk/125/noflash/1875-1900/hopkinson_john.html)
The magnetic equivalent of Ohm's law is named after him.
Hopkinson's law[?], Maxwell's laws[?]
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