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oersted

 
Dictionary: oer·sted   (ûr'stĕd') pronunciation
n. (Abbr. Oe)

The centimeter-gram-second electromagnetic unit of magnetic intensity, equal to the magnetic intensity one centimeter from a unit magnetic pole.

[After Hans Christian Oersted (1777-1851), Danish physicist.]


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Measures and Units: oersted
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[Etymology: H. C. Ørsted; Denmark 1777-1851] magnetic field strength. Symbol Oe. Metric-c.g.s.-e.m.u. and -Gaussian 1930 Identically the strength 1 centimetre from a (notional) unit magnetic pole, = ¼π abampere·turn·cm-1; technically defined in a three-dimensional system, it corresponds in the four-dimensional electromagnetic sector of the SI system to 1000/ A·turn·m-1. It was called the gauss before the International Electrotechnical Committee agreement in 1930 (when that name was applied to flux density),
[Nature Vol. 126, 252 (1930)] during which time oersted was sometimes the unit of magnetic reluctance. The oersted is a very small unit, only about four times Earth's magnetic field strength at the surface. The corresponding practical unit is the even smaller praoersted, = 10-3 oersted.

Medical Dictionary: oer·sted
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(ûr'stĕd')
n.

The centimeter-gram-second electromagnetic unit of magnetic intensity, equal to the magnetic intensity one centimeter from a unit magnetic pole.

WordNet: oersted
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Note: click on a word meaning below to see its connections and related words.

The noun has one meaning:

Meaning #1: the magnetic field strength 1 cm from a unit magnetic pole


Wikipedia: Oersted
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Oersted (abbreviated as Oe) is the unit of magnetizing field (also known as magnetic field strength or intensity) in the CGS system of units.

Contents

History

The unit was established by the IEC in 1930 [1] in honour of the Danish physicist Hans Christian Ørsted.

Definition

The oersted is defined as 1000/4π (≈79.5774715) amperes per meter of flux path, in terms of SI units.[2][3][4][5][6]

The oersted is closely related to the gauss, the CGS unit of magnetic induction or magnetic field. In a vacuum, 1 G = 1 Oe, whereas in a medium having permeability μ, their relation is G = μ Oe. One oersted also equals a magnetomotive force (mmf) of 1 gilbert per centimeter of flux path.[citation needed]

H(\mbox{Oe})= \frac{1000}{4 \pi} \frac{I(\mbox{A})}{l(\mbox{m})}
  • In SI units, 1 gilbert = 10/4π ampere-turns = about 0.7958 ampere-turn.
  • The stored energy in a magnet, called magnet performance, or "magnetic energy product", is typically measured in units of megagauss-oersteds (MGOe). Units of MGOe are equivalent to megajoules per cubic meter.

See also

References


 
 

 

Copyrights:

Dictionary. The American Heritage® Dictionary of the English Language, Fourth Edition Copyright © 2007, 2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.  Read more
Measures and Units. A Dictionary of Weights, Measures, and Units. Copyright © Donald Fenna 2002, 2004. All rights reserved.  Read more
Medical Dictionary. The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company Read more
WordNet. WordNet 1.7.1 Copyright © 2001 by Princeton University. All rights reserved.  Read more
Wikipedia. This article is licensed under the Creative Commons Attribution/Share-Alike License. It uses material from the Wikipedia article "Oersted" Read more

 

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