magnetic flux

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flux, magnetic,

in physics, term used to describe the total amount of magnetic fieldfield,
in physics, region throughout which a force may be exerted; examples are the gravitational, electric, and magnetic fields that surround, respectively, masses, electric charges, and magnets. The field concept was developed by M.
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 in a given region. The term flux was chosen because the power of a magnet seems to "flow" out of the magnet at one pole and return at the other pole in a circulating pattern, as suggested by the patterns formed by iron filings sprinkled on a paper placed over a magnet or a conductor carrying an electric current. These patterns are called lines of induction. Although there is no actual physical flow, the lines of induction suggest the correct mathematical description of magnetism in terms of a field of force. The lines of induction originate on the north pole of the magnet and end on the south pole; their direction at any point is the direction of the magnetic field, and their density (the number of lines passing through a unit area) gives the strength of the field. Near the poles where the lines converge, the field and the force it produces are large; away from the poles where the lines diverge, the field and force are progressively weaker.
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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Magnetic Flux


the flux Φ of the vector of magnetic induction B through a surface. The magnetic flux through a small area dS within which the vector B can be considered constant is expressed by the product of the area and the projection Bn of the vector onto the normal to the area, that is, by dΦ = BndS. The magnetic flux Φ through a finite surface S is defined by the integral

Ф = S Bn dS

For a closed surface, this integral is equal to zero, reflecting the solenoidal character of a magnetic field, that is, the absence in nature of magnetic charges—the sources of a magnetic field. The unit of magnetic flux in the International System of Units is the weber, and in the cgs system, the maxwell (1 weber = 108 maxwells).

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.

magnetic flux

[mag′ned·ik ′fləks]
The integral over a specified surface of the component of magnetic induction perpendicular to the surface.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Outside the toroidal surface, only a <<buckling>> of the field in the region between the coils is shown for lines with a common magnetic flux density direction, which coincides with the field direction in the central part of the torus.
8, the net static friction with the presence of magnetic flux passing through steel plate and platform is given by:
Additionally, it can be observed that raising the magnetic flux in the air-gap using Halbach array also raises the gained phase voltage of the corresponding machine.
When studying the MHD wave propagation in the untwisted magnetic flux tube we shall use two approaches, namely, of compressible plasmas in both media and the simplified limit of incompressible and cool plasmas--a similarity of dispersion curves patterns, obtained from corresponding dispersion relations, will eventually justify the usage of the second approach in particular in the case of twisted tube.
the relative reluctivity of the material [[upsilon].sub.r] = 1/[[mu].sub.r] is a function of the magnetic flux density, which is a function of the unknown vector [{a}.sup.n+1], the residual {r} in Eq.
The longitudinal component of magnetic flux density within pipe at control zone (above the coil) was calculated.
The difficulty Is that this procedure is not accurate because the magnetic flux behaviour in an Epstein Frame Test sample Is different from what really happens when a motor Is run.
London, July 3 ( ANI ): A Spanish instrument known as IMaX magnetograph has observed the sun for the formation and evolution of a magnetic flux tubes on its surface.
Theoretical studies suggest that constant magnetic flux densities in the range of 25-100 Tesla would be required to affect ionic currents of nerve processes [7],[8].
In this study, an MFL sensor was applied to detect the local fault (LF) damage of steel cables, by capturing the magnetic flux leakage.