Transcript: Faraday showed that the forces of electricity and magnetism were related, but what did this have to do with light? The answer was provided in the 19th century by the Scottish physicist James Clark Maxwell. Maxwell was a theorist who produced an elegant theory of light and electromagnetic radiation. He had a set of four equations relating the two forces of electricity and magnetism, and he showed that changing electric or magnetic forces create a disturbance that behaves like a wave. The electric and magnetic forces are always linked, and so we refer to this as electromagnetic radiation or electromagnetic waves.