electromagnetism

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electromagnetism

1. magnetism produced by an electric current
2. the branch of physics concerned with magnetism produced by electric currents and with the interaction of electric and magnetic fields

Electromagnetism

The branch of science dealing with the observations and laws relating electricity to magnetism. Electromagnetism is based upon the fundamental observations that a moving electric charge produces a magnetic field and that a charge moving in a magnetic field will experience a force. The magnetic field produced by a current is related to the current, the shape of the conductor, and the magnetic properties of the medium around it by Ampère's law. The magnetic field at any point is described in terms of the force that it exerts upon a moving charge at that point. The electrical and magnetic units are defined in terms of the ampere, which in turn is defined from the force of one current upon another. The association of electricity and magnetism is also shown by electromagnetic induction, in which a changing magnetic field sets up an electric field within a conductor and causes the charges to move in the conductor. See Eddy current, Electricity, Electromagnetic induction, Faraday's law of induction, Hall effect, Inductance, Lenz's law, Reluctance

electromagnetism

[i¦lek·trō′mag·nə‚tiz·əm]
(physics)
Branch of physics relating electricity to magnetism.
Magnetism produced by an electric current rather than by a permanent magnet.
References in periodicals archive ?
Henry had started his pioneering work in electricity and magnetism as a professor at Albany Academy in 1826.
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The culminating work of Maxwell (see 1855) came in 1865 when he began to devise a set of equations (Maxwell's equations), simple in form, that expressed all the varied phenomena of electricity and magnetism and bound them together indissolubly, as Newton had done for gravitation.
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of Dallas), Apostol (California Institute of Technology) and Goodstein (California Institute of Technology) have produced this textbook on electricity and magnetism, and how the relationship between these two forces led to the Theory of Relativity.
The complexity arises from the fundamental interdependence of electricity and magnetism.
Maxwell's equations (see 1865) are not quite symmetrical with respect to electricity and magnetism.
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Many decades ago, physicists working on a unified mathematical description of electricity and magnetism found this vector potential, from which descriptions of both electric and magnetic phenomena could be derived.
Theories that posit an exact and complete symmetry between electricity and magnetism predict their existence; electric monopoles are very common.

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