electromagnetism

n. magnetism produced by electric currents

Electromagnetism is the physics of the electromagnetic field: a field which exerts a force on particles that possess the property of electric charge, and is in turn affected by the presence and motion of those particles.The magnetic field is produced by the motion of electric charges, i.e. electric current. The magnetic field causes the magnetic force associated with magnets.While preparing for an evening lecture on 21 April 1820, Hans Christian Ørsted developed an experiment which provided evidence that surprised him. As he was setting up his materials, he noticed a compass needle deflected from magnetic north when the electric current from the battery he was using was switched on and off. This deflection convinced him that magnetic fields radiate from all sides of a wire carrying an electric current, just as light and heat do, and that it confirmed a direct relationship between electricity and magnetism.
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Electromagnetism, n one of nature's four forces; the electromagnetic force is pervasive, effectual at subatomic distances and at astronomical [more]Electromagnetism - Community and Resources

Noun
1. magnetism produced by an electric current; "electromagnetism was discovered when it was observed that a copper wire carrying an electric current can magnetize pieces of iron or steel near it"
(hypernym) magnetism, magnetic attraction, magnetic force
2. the branch of physics concerned with electromagnetic phenomena
(synonym) electromagnetics
(hypernym) physics, physical science, natural philosophy

One of the four four forces of nature. Electromagnetism acts between all particles possessed of electric charge: e.g., electrons, protons, atomic ions. It is manifested in two interconnected forces, those of electricity and magnetism. Both have polarities as well as magnitudes. In electric charges, the polarities are distinguished by sign, positive and negative. In magnetism, the polarities are denoted either north or south. In both cases, like polarities repel whilst unlike polarities attract. The virtual particles which carry the electromagnetic force are virtual photons.