oersted

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.]

[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/_4π 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.

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

The noun has one meaning:

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

For other uses, see Oersted (disambiguation).

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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. It is defined as 1000/4π (≈79.5774715) amperes per meter of flux path, in terms of SI units.^{[1][2][3][4][5]} 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.

The unit was established by the IEC in 1930 ^[6] in honour of Hans Christian Ørsted, who discovered electromagnetism in 1820. From the Standard Handbook of Electrical Engineers; "It is that magnetic vector quantity at a point in a magnetic field which measures the ability of electric currents or magnetized bodies to produce magnetic induction at the given point."

• 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

• Centimetre gram second system of units

References

1. ^ Magnetic Conversion Factors
2. ^ EMF Fundamentals
3. ^ oersted@Everything2.com
4. ^ Derived CGS Units with Special Names
5. ^ Homework please help!? - Yahoo! Answers
6. ^ http://www.iec.ch/about/history/ IEC history

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