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electromagnetism
1: magnetism developed by a current of electricity2 a: a fundamental physical force that is responsible for interactions between charged particles which occur because of their charge and for the emission and absorption of photons, that is about a hundredth the strength of the strong force, and that extends over infinite distances but is dominant over atomic and molecular distances —called also electromagnetic force
— compare gravity 3a(2)
, strong force
, weak force b: a branch of physical science that deals with the physical relations between electricity and magnetism
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