Einstein's Relativity Experiement
Show that electromagnetic theory obeys a relativity principle.◙
Magnet, earth inductor coil, and overhead projector microammeter.◙
Measure the current (qualitatively) in a coil when the coil and a bar magnet are in relative motion. Einstein (1905) complained that the standard conceptualization (electric forces if the magnet moves, magnetic forces if the coil moves) seems more convoluted than the phenomenon which appears the same whichever component is "at rest."
Einstein, Lorentz, Minkowski, and Weyl, The Principle of Relativity, (1905). ◙Art Huffman, Special relativity demonstration, AJP 48, 780-781 (1980). ◙Lecture Demonstration Record Form.