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interaction, or electromagnetic force, a long-range force
involving the electric and magnetic properties of ELEMENTARY
PARTICLES. It is responsible for the repulsion of like and
attraction of unlike electric charges and explains atomic
structure and the properties and other forms of ELECTROMAGNETIC
RADIATION. The electromagnetic interaction is mediated, or
carried, by PHOTONS. Because its effects can be easily observed,
electromagnetism is the most thoroughly studied and best
understood of the four fundamental forces of nature. The same
laws that govern electromagnetism on the subatomic scale also
apply on a large scale in motors, generators, and electronic
equipment. A moving electric charge gives rise to a magnetic
field, and if its motion changes the magnetic field varies and
in turn produces an electric field; this is th