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Longman Dictionary of Contemporary English
▪ Albert Einstein spent the last 50 years of his life unsuccessfully trying to unify the theories of electromagnetism and gravity.
▪ In addition to the usual material, it contains useful chapters on electromagnetism and relativistic fluids and introduces the reader to tensor notation.
▪ In particular they made great progress in their attempts to put electromagnetism and the weak nuclear force together within the same theoretical framework.
▪ It was not unlikely that they were closely linked, or even identical, with the forces of gravity and of electromagnetism.
▪ Newtonian mechanics, wave optics and classical electromagnetism all constituted and perhaps constitute paradigms and qualify as sciences.
▪ The quantitative details of classical electromagnetism yield an estimated time of about 10 -8 seconds for this collapse to occur.
▪ They are difficult to explain within the laws of electromagnetism.
▪ Together these results produce the combined subject of electromagnetism.
Douglas Harper's Etymology Dictionary

also electro-magnetism, 1821; see electro- + magnetism.


n. 1 A unified fundamental force that combines the aspects of electricity and magnetism and is one of the four fundamental forces. (technically it can be unified with weak nuclear to form electroweak) Its gauge boson is the photon. 2 electricity and magnetism, collectively, as a field of study.

  1. n. 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"

  2. the branch of physics concerned with electromagnetic phenomena [syn: electromagnetics]


Electromagnetism is a branch of physics which involves the study of the electromagnetic force, a type of physical interaction that occurs between electrically charged particles. The electromagnetic force usually exhibits electromagnetic fields, such as electric fields, magnetic fields, and light. The electromagnetic force is one of the four fundamental interactions (commonly called forces) in nature. The other three fundamental interactions are the strong interaction, the weak interaction, and gravitation.

The word electromagnetism is a compound form of two Greek terms, ἤλεκτρον, ēlektron, " amber", and μαγνῆτις λίθος magnētis lithos, which means "magnesian stone", a type of iron ore. Electromagnetic phenomena is defined in terms of the electromagnetic force, sometimes called the Lorentz force, which includes both electricity and magnetism as different manifestations of the same phenomenon.

The electromagnetic force plays a major role in determining the internal properties of most objects encountered in daily life. Ordinary matter takes its form as a result of intermolecular forces between individual atoms and molecules in matter, and are a manifestation of the electromagnetic force. Electrons are bound by the electromagnetic force to atomic nuclei, and their orbital shapes and their influence on nearby atoms with their electrons is described by quantum mechanics. The electromagnetic force governs the processes involved in chemistry, which arise from interactions between the electrons of neighboring atoms.

There are numerous mathematical descriptions of the electromagnetic field. In classical electrodynamics, electric fields are described as electric potential and electric current. In Faraday's law, magnetic fields are associated with electromagnetic induction and magnetism, and Maxwell's equations describe how electric and magnetic fields are generated and altered by each other and by charges and currents.

The theoretical implications of electromagnetism, in particular the establishment of the speed of light based on properties of the "medium" of propagation ( permeability and permittivity), led to the development of special relativity by Albert Einstein in 1905.

Although electromagnetism is considered one of the four fundamental forces, at high energy the weak force and electromagnetic force are unified as a single electroweak force. In the history of the universe, during the quark epoch the unified force broke into the two separate forces as the universe cooled.

Usage examples of "electromagnetism".

What Einstein proposed was that the velocity-dependencies deduced by Lorentz were not part of some fudge-factor needed for electromagnetism, but that they expressed fundamental properties of the nature of space and time that were true universally, and hence called for a revision of mechanics.

Gravity is carried by ripples in the familiar three space dimensions, while electromagnetism is carried by ripples involving the new, curled-up dimension.

The new equations resulting from the extra dimensions were strikingly reminiscent of those used in the description of electromagnetism, and the strong and the weak forces.

We detect the light from distant quasars only because the laws of electromagnetism are the same ten billion light years away as here.

The Annihilator translates the strong nuclear force into electromagnetism for a fraction of a second, causing atoms to instantly fling apart.

The Standard Model consists of six quarks, six leptons, five known bosons and a postulated sixth, the Higgs boson (named for a Scottish scientist, Peter Higgs), plus three of the four physical forces: the strong and weak nuclear forces and electromagnetism.

The laws of electromagnetism themselves had proved strikingly successful in predicting the existence of propagating waves, their velocity and other quantities, and appeared to be on solid ground.

At low energies what you see are three separate subspaces, for electromagnetism and the weak and strong forces.

And when they'd cooled, the shapes into which they'd frozen had just happened to favor topologies close to a certain ten-dimensional total space-one which gave rise to particles like quarks and electrons, and forces like gravity and electromagnetism.

After another ludicrously brief interval it was joined by electromagnetism and the strong and weak nuclear forces—.

The four forces you know about are gravitation, electromagnetism, the weak nuclear force, and the strong nuclear force.

Apparently, whatever energy magic useda matter of considerable debate among the wizards of Dest, with a hybrid of electromagnetism and the weak nuclear interaction credited by the most currently fashionable theoryinterfered slightly with cyborg systems.

That love is a basic force of the universe, like gravity and electromagnetism, like strong and weak nuclear force.

As his ass plummeted, he was reminded that gravity yet to be reckoned with electromagnetism, strong nuclear force, and weak nuclear force, the other fundamental forces of the universe.