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magnetic field

a region of space near a magnet, electric current, or moving charged particle in which a magnetic force acts on any other magnet, electric current, or moving charged particle.
Origin of magnetic field
1835-45 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for magnetic field
Contemporary Examples
Historical Examples
  • The difference between the rate of rotation of the rotor and that of the magnetic field is called the "slip."

    Physics Willis Eugene Tower
  • It is this magnetic field of the current that causes the needle to turn.

    Physics Willis Eugene Tower
  • But how can a magnet, not subject to a varying current, change its magnetic field?

    The Machinery of the Universe Amos Emerson Dolbear
  • It may be produced by a single coil rotating in a magnetic field.

    Physics Willis Eugene Tower
  • Thus the supply of electricity to the plate has been entirely stopped by the magnetic field.

  • It is not necessary that the magnetic field be created by a permanent magnet.

  • Now they're trying to make it come out right by allowing for the effect of the earth's magnetic field on a metal meteorite.

    Creatures of the Abyss Murray Leinster
  • The magnetic field surrounding a bar magnet is shown in Fig. 2.

British Dictionary definitions for magnetic field

magnetic field

a field of force surrounding a permanent magnet or a moving charged particle, in which another permanent magnet or moving charge experiences a force Compare electric field
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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magnetic field in Science
magnetic field  
  1. A field of force associated with changing electric fields, as when electric charges are in motion. Magnetic fields exert deflective forces on moving electric charges. Most magnets have magnetic fields as a result of the spinning motion of the electrons orbiting the atoms of which they are composed; electromagnets create such fields from electric current moving through coils. Large objects, such as the earth, other planets, and stars, also produce magnetic fields. See Note at magnetism.

  2. See magnetic field strength.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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magnetic field in Culture

magnetic field definition

A magnetic field is said to exist in a region if a force can be exerted on a magnet. If a compass needle is deflected when it is put at a particular location, we say a magnetic field exists at that point, and the strength of the field is measured by the strength of the force of the compass needle. The Earth, the sun, and the Milky Way galaxy all have magnetic fields. All known magnetic fields are caused by the movement of electrical charges. Electrons in orbit in atoms give rise to magnetic fields, so that every atom is, like the Earth, surrounded by a magnetic field. (See magnet and magnetism.)

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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