Also found in: Dictionary, Thesaurus, Medical, Wikipedia.
Related to electromagnetism: Electromagnetic force, Electromagnetic induction


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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005


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

McGraw-Hill Concise Encyclopedia of Physics. © 2002 by The McGraw-Hill Companies, Inc.


Branch of physics relating electricity to magnetism.
Magnetism produced by an electric current rather than by a permanent magnet.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
This time, he sought a theory that would bring the two classical fields, electromagnetism and gravity, into a single, physical unity.
In addition, we use rationalized MKSA units for Electromagnetism, as the traditionally used Gaussian units are gradually being replaced by rationalized MKSA units in more recent textbooks (see for example [12]).
Author Dawson Church combines findings backed by 300-plus studies from fields as diverse as genetics, electromagnetism, and medicine to validate metaphysical concepts that have long been affirmed by practitioners of yoga, prayer, meditation, acupuncture, and other alternative health modalities, as well as by allopathic physicians who have witnessed the power of faith and belief to overturn what appeared to be a patient's genetic destiny.
However, this patent did not refer to any known scientific theory of electromagnetism and could never have received and transmitted radio waves.
Aa This unification of electricity and magnetism into what, from the time on, has been known as electromagnetism came by with the help of one Sir James Clark Maxwell, whose theory had the ubiquitous result that a wave made of electromagnetic fields would travel at exactly the speed of light.
Scientists have already used electromagnetism to focus nanoparticles on cancers, but MAGSELECTOFECTION showed it did not help them penetrate cell walls.
The second new CNT device uses the fundamental Lorentz magnetic force from the basic laws of Electromagnetism as a switching mechanism between two conducting CNTs.
Specialising in electromagnetism and electrochemistry, Faraday is regarded as a pioneer of early motor technology and also invented an early form of the bunsen burner.
But the force inside a solid does not follow the laws of fluid flow, heat conduction, or electromagnetism, so the analogies aren't valid.
And it claims maglev - which uses electromagnetism - would require substantial upfront investment.
"He also explores things that you've seen on the show but wanted to know more about, such as what's behind the wall in the Hatch, where the mysterious electromagnetism is."
Using well-known episodes from the history of science, such as mechanical philosophy and Newtonian gravitation, elective affinities and the chemical revolution, natural history and taxonomy, evolutionary biology, the dynamical theory of electromagnetism, and quantum theory, Dear here reveals how the very different principles of knowing and doing were brought together as a new enterprise, science, which would be practiced by a new kind of person, the scientist.

Full browser ?