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Electromagnetic field, an electromagnetic field also emf or em field likewise any new motion of a charge in a region that seemed previously to contain only a magnetic field. History of science history and events historical society, department of the history of science harvard university histsci fas harvard edu welcome the department of the history of science is a lively interdisciplinary. Weak interaction, in particle physics the weak interaction the weak force or weak nuclear force is one of the four known fundamental interactions of nature alongside the strong.

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