electromagnetism

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Related to Electric waves: Electromagnetic energy, EM Waves

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
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

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

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

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
The system consists of two pairs of up to 1.5-kilometer-long transceiver cables -- one sending electric waves and the other receiving the waves -- set up in parallel around the area to be monitored plus a censor which detects any distortion in electric wave signals received by the receiver cable.
A striking example of this is the work on electric waves: although its later significance was as confirmation of Maxwell's scheme, Hertz initially intended no test of theory.
At the same time, Wikswo observed such a dog bone pattern in a rabbit's heart by detecting the electric waves as they passed electrodes stationed near the stimulating electrode.
Battery- operated alarms and clocks give off virtually no electric waves.
McMahon trained last year's winner Electric Waves who went on to Group 3 success in the Cornwallis Stakes at Ascot and the trainer is hoping his filly could follow in her footsteps.
ED McMahon made a second profitable visit to Newbury in less than a month as Electric Waves collected the Listed Bathwick Tyres St Hugh's Stakes, writes TOM PEACOCK.
Data for each piece of baggage with an IC-embedded claim tag are read by a device using electric waves, the officials said, adding the system was developed at low cost by making use of a special printing technology.
The device consists of four antennas and as many transmitters and receivers and narrows the range of electric waves used for communication between two terminals by adjusting signals from each antenna.
Ed McMahon won the Group 3 Cornwallis Stakes at Ascot last October with Electric Waves and he is targeting the race again with Artistic Jewel, who took the 5f maiden fillies' stakes on her debut under Graham Gibbons, overturning odds-on Royal Red by an easy two and three-quarter lengths.
WARWICK: 6.25 What A Day, 6.55 Electric Waves, 7.25 Red Scintilla, 7.55 Lady Jane Digby (nap), 8.25 Bramalea, 8.55 Ocean Legend.
The system will use integrated circuit (IC) chips in place of bar codes to identify baggage checked at airports, allowing bags to be sorted by electric waves, according to the Land, Infrastructure and Transport Ministry.
JR East, which currently requests that passengers not use cellular phones, will institute a total ban during rush hours as the phones' electric waves could cause malfunctioning of such medical equipment as pacemakers and as complaints about the phones have been increasing, railway officials said.