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In the 19th century it had become clear that [[electricity]] and [[magnetism]] were related, and their theories were unified: wherever charges are in motion electric current results, and magnetism is due to electric current.<ref name="LyonsTA">Lyons, T. A. (1901). ''A treatise on electromagnetic phenomena, and on the compass and its deviations aboard ship. Mathematical, theoretical, and practical''. New York: J. Wiley & Sons.</ref> The source for [[electric field]] is [[electric charge]], whereas that for [[magnetic field]] is [[electric current]] (charges in motion).
{{multiple image|perrow = 2|total_width=250
| header = Pioneers of electromagnetic theory
| header_align = center
| caption_align = center
| image1 = Hans Christian Ørsted by H. W. Bissen.jpg
| caption1 = [[Hans Christian Ørsted ]]
| image2 = Ampere Andre 1825.jpg
| caption2 = [[ André-Marie Ampère ]]
| image3 = M Faraday Th Phillips oil 1842.jpg
| caption3 = [[ Michael Faraday]]
| image4 = James-Clerk-Maxwell-1831-1879.jpg
| caption4 = [[James Clerk Maxwell]]
}}
== Ancient and classical history ==
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