E*lec`tro-mag*net"ic (?), a. Of, Pertaining to, or produced by, magnetism which is developed by the passage of an
electric current. Electro-magnetic engine, an engine in which the motive force is electro-magnetism. -- Electro- magnetic theory of light (Physics),
a theory of light which makes it consist in the rapid alternation of transient electric
currents moving transversely to the direction of the ray.
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