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magnetic field

A field of force that is generated by electric currents. The Earth's magnetic field is believed to be generated by the rotation of the molten iron–nickel outer core around the solid inner ...

magnetic field

magnetic field   Quick reference

A Dictionary of Construction, Surveying and Civil Engineering (2 ed.)

Reference type:
Subject Reference
Current Version:
2020

... field A force field surrounding a magnetized object (a magnet) or an area (the Magnetic North or South...

magnetic field

magnetic field   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
43 words

... field 1 a field of force existing in the neighbourhood of either a permanent magnet or a circuit carrying an electric current. Another magnet will experience a couple when placed in a magnetic field. 2 an alternative name for magnetic field strength...

magnetic field

magnetic field   Quick reference

A Dictionary of Environment and Conservation (3 ed.)

Reference type:
Subject Reference
Current Version:
2017

... field A field of force that is generated by electric currents. The Earth's magnetic field is believed to be generated by the rotation of the molten iron–nickel outer core around the solid inner core , like a dynamo. See also palaeomagnetism...

magnetic field

magnetic field   Quick reference

The Concise Oxford Dictionary of Mathematics (6 ed.)

Reference type:
Subject Reference
Current Version:
2021

...magnetic field A vector field which exerts a force on moving electric charges. See Maxwell’s equations...

magnetic field

magnetic field   Quick reference

A Dictionary of Physics (8 ed.)

Reference type:
Subject Reference
Current Version:
2019
Subject:
Science and technology, Physics
Length:
215 words
Illustration(s):
1

...magnetic field A field of force that exists around a magnetic body ( see magnetism ) or a current-carrying conductor. Within a magnetic field a magnetic dipole may experience a torque and a moving charge may experience a force. The strength and direction of the field can be given in terms of the magnetic flux density (or magnetic induction ), symbol B ; it can also be given in terms of the magnetic field strength ( magnetizing force or magnetic intensity ), symbol H . The magnetic flux density is a vector quantity and is the magnetic flux ...

magnetic field

magnetic field   Quick reference

A Dictionary of Space Exploration (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

...magnetic field The region around a permanent magnet, or around a conductor carrying an electric current, in which a force acts on a moving charge or on a magnet placed in the field. The force cannot be seen; only the effects it produces are visible. The field can be represented by lines of force parallel at each point to the direction of a small compass needle placed on them at that point. These invisible lines of force are called the magnetic field or the flux lines. A magnetic field's magnitude is given by the magnetic flux density (the number of flux lines...

magnetic field

magnetic field   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018

... field The space surrounding a magnet or a current-carrying conductor and containing magnetic flux . It may be represented by lines of force whose direction at any point is the direction of the force exerted on a small coil (a search coil) placed in the field at that point. The direction of the force is normal to the magnetic flux density at that point. It is assumed that the dimensions of the coil are sufficiently small so as not to disturb the magnetic conditions. ...

magnetic field

magnetic field   Quick reference

World Encyclopedia

Reference type:
Subject Reference
Current Version:
2004
Subject:
Encyclopedias
Length:
151 words

... field Region surrounding a magnet , or a conductor through which a current is flowing, in which magnetic effects, such as the deflection of a compass needle, can be detected. A magnetic field can be represented by a set of lines of force (flux lines) spreading out from the poles of a magnet or running around a current-carrying conductor. The direction of a magnetic field is the direction a tiny magnet takes when placed in the field. Magnetic poles are the field regions in which magnetism appears to be concentrated. If a bar magnet is suspended to...

pseudo-magnetic field

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A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...magnetic field A magnetic field that is transformed to simulate gravitational acceleration for the purpose of computational...

intergalactic magnetic field

intergalactic magnetic field   Quick reference

A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

...magnetic field The weak magnetic field of less than 10 −12 tesla believed to be present in the space between galaxies. The intergalactic field may have arisen spontaneously in the very early Universe, or from the effect of atomic particles and magnetic fields from cosmic radio sources. It could be ten times stronger in clusters of...

magnetic field strength

magnetic field strength   Reference library

Oxford Dictionary of Biochemistry and Molecular Biology (2 ed.)

Reference type:
Subject Reference
Current Version:
2008
Subject:
Science and technology, Life Sciences
Length:
85 words

... field strength or magnetic field or (formerly) magnetic intensity symbol : H (italic bold); a vector quantity, the magnetizing force at any point in a medium. It is measured by a couple that would act on a small magnet of unit moment placed at that point with its axis at right angles to the direction of the magnetic field. It is the magnetic flux density , B , divided by the permeability , μ ; i.e. H = B / μ . The SI derived unit H = A m −1...

galactic magnetic field

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A Dictionary of Astronomy (3 ed.)

Reference type:
Subject Reference
Current Version:
2018

...magnetic field The magnetic field in interstellar space in the disk of a galaxy. Magnetic field strengths between 10 −9 and 10 −10 tesla occur in the disks of spiral galaxies, with an overall pattern roughly following the spiral structure. Fields in elliptical galaxies are much more difficult to estimate, but in those that are strong radio emitters it appears that the fields may reach 10 −7 ...

magnetic field strength

magnetic field strength (symbol: H; unit: ampere/metre)   Quick reference

A Dictionary of Electronics and Electrical Engineering (5 ed.)

Reference type:
Subject Reference
Current Version:
2018
Subject:
Science and technology, Engineering and Technology
Length:
73 words
Illustration(s):
1

... field strength ( magnetizing force ) ( symbol: H ; unit: ampere/metre ) The strength of a magnetic field at a point in the direction of the line of force at that point. It is defined in a vacuum from the equation B = μ 0 H where B is the magnetic flux density and μ 0 is a constant, the permeability of free space. See also Ampere’s law . ...

alternating-magnetic-field demagnetization

alternating-magnetic-field demagnetization   Quick reference

A Dictionary of Geology and Earth Sciences (5 ed.)

Reference type:
Subject Reference
Current Version:
2020

...magnetic-field demagnetization ( AF demagnetization , thermal cleaning ) A common method for demagnetizing ( see demagnetization ) rock samples that is widely used in palaeomagnetism and archaeomagnetism because of its simplicity and because it produces no chemical change in the samples. It can cause problems associated with anhysteretic and rotational remanences, and is only fully suitable for magnetite -bearing rock...

magnetic field (origin of the Earth's internal field)

magnetic field (origin of the Earth's internal field)   Reference library

The Oxford Companion to the Earth

Reference type:
Subject Reference
Current Version:
2003
Subject:
Science and technology, Earth Sciences and Geography
Length:
1,347 words
Illustration(s):
2

...dynamo model. The single-disc dynamo of Larmor (a) is able to reinforce an initial magnetic field, but a coupled double-disc dynamo (b) is also able to replicate the chaotic reversals observed in nature. H magnetic field. Geomagnetists deciphering the mysteries of the origin of the Earth's magnetic field constrain their models with snapshots of the magnetic field obtained from a variety of sources: satellites such as Magsat ( c. 1980 ), which measure the near-Earth magnetic field; the POGO series satellites flown in the mid-1960s; surface geomagnetic...

magnetic field

magnetic field noun   Reference library

The Canadian Oxford Dictionary (2 ed.)

Reference type:
English Dictionary
Current Version:
2005
Subject:
English Dictionaries and Thesauri
Length:
16 words
magnetic field

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New Oxford American Dictionary (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
47 words
magnetic field

magnetic field noun   Quick reference

Oxford Dictionary of English (3 ed.)

Reference type:
English Dictionary
Current Version:
2015
Subject:
English Dictionaries and Thesauri
Length:
45 words
magnetic field strength

magnetic field strength   Reference library

The New Oxford Dictionary for Scientific Writers and Editors (2 ed.)

Reference type:
Subject Reference
Current Version:
2009

... field strength Symbol: H A *vector quantity, the ratio of *magnetic flux density B to the *permeability , μ, of the medium. The direction at a given point is that of the flux density at that point. The *SI unit is the ampere per metre. Also called magnetic field...

magnetic field

magnetic field  

Reference type:
Overview Page
A field of force that is generated by electric currents. The Earth's magnetic field is believed to be generated by the rotation of the molten iron–nickel outer core around the solid inner core, like ...

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