What led me more or less directly to the special theory of relativity was the conviction that the electromotive force acting on a body in motion in a magnetic field was nothing else but an electric field.
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Letter to the Michelson Commemorative Meeting of the Cleveland Physics Society (1952), as quoted by R.S.Shankland, Am. J. Phys., 32, 16 (1964), p. 35, republished in Anthony Philip French, Special Relativity (1968) ISBN 0177710756, p. 226.