Difference between revisions of "Oersted (unit)"

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The '''oersted''' (abbreviated as Oe) is  the unit of [[magnetic field]] strength |'''H'''| in the
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cgs-emu (centimeter-gram-second electromagnetic unit) system of units. The field strength in a point in vacuum is 1 Oe if a unit magnetic pole in the point experiences a force of 1 [[dyne]] ( = 1&sdot;10<sup>&minus;5</sup> newton). The cgs-emu defining equation of the oersted is: Oe =
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cm<sup>&minus;1/2</sup> g<sup>1/2</sup> s<sup>&minus;1</sup>.
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The oersted is also the unit of magnetic field strength in the system of [[Gaussian units]].
  
The '''oersted''' (abbreviated as Oe) is  the unit of magnetic-field strength |'''H'''| in the [[Gaussian units|Gaussian]] system of physical units. Gaussian units are cgs (centimeter-gram-second) units.  
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In agreement with the  [[Biot-Savart law]] one may also define one oersted as the magnetic field strength |'''H'''| in the center of a conducting loop with radius of 1 cm, carrying a current of 10/(2&pi;) A.
  
The unit is named after [[Hans Christian Oersted]]. It is defined as the strength of a [[magnetic field]]  in vacuum:  A unit magnetic pole in a field of one Oe experiences a mechanical force of one [[dyne]] ( = 10<sup>&minus;5</sup> newton) in the direction of the field. Note here that in the cgs system a unit magnetic pole  repels a like pole at a distance of one centimetre with a force of one dyne. One oersted equals 1000/4π A/m &nbsp; [ampere per meter, the SI unit for |'''H'''| ].
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One oersted equals 1000/4π A/m &nbsp; (ampere per meter, which is  the [[SI]] unit for |'''H'''|).  
  
Before 1932 the oersted was known as the gauss, a name sometimes still applied, though now more properly used for the Gaussian unit of  strength of [[magnetic induction]] |'''B'''|.
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The oersted is named after the Danish physicist [[Hans Christian Oersted]]. Before 1932 the oersted was known as gauss, a name sometimes still applied, though now more properly used for the cgs-emu unit of  strength of [[magnetic induction]] |'''B'''|.

Revision as of 15:23, 23 May 2008

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The oersted (abbreviated as Oe) is the unit of magnetic field strength |H| in the cgs-emu (centimeter-gram-second electromagnetic unit) system of units. The field strength in a point in vacuum is 1 Oe if a unit magnetic pole in the point experiences a force of 1 dyne ( = 1⋅10−5 newton). The cgs-emu defining equation of the oersted is: Oe = cm−1/2 g1/2 s−1. The oersted is also the unit of magnetic field strength in the system of Gaussian units.

In agreement with the Biot-Savart law one may also define one oersted as the magnetic field strength |H| in the center of a conducting loop with radius of 1 cm, carrying a current of 10/(2π) A.

One oersted equals 1000/4π A/m   (ampere per meter, which is the SI unit for |H|).

The oersted is named after the Danish physicist Hans Christian Oersted. Before 1932 the oersted was known as gauss, a name sometimes still applied, though now more properly used for the cgs-emu unit of strength of magnetic induction |B|.