ALFRED PASIEKA / SCIENCE PHOTO LIBRARY ALFRED PASIEKA / SCIENCE PHOTO LIBRARY
Maxwell's equations. Differential equations which relate electric and magnetic fields to charges and currents. These were deduced by the British physicist James Clerk Maxwell in 1861-2. The equations predict that any change in an electric or magnetic force sends electromagnetic waves spreading through space. This theory was proved by the discovery of radio waves in 1888 by Hertz.
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