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Oersted
From Wikipedia, the free encyclopedia
Oersted (H)
The unit of magnetizing force (magnetic field strength) in the CGS electromagnetic system. One Oersted equals a mmf of 1 gilbert per centimeter of flux path. One oersted equals 1000/4π, or 79.58 ampere-turns per meter[1].
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.[1]
- One oersted equals a magnetomotive force of one gilbert per centimeter of flux path.
- 1.257 is the conversion factor from 4π/10 if I is expressed in amperes, and l is expressed in centimeters.
- Ampere-turns = N x I
- Magnetomotive force (mmf) = 1.257 N I, so H = mmf divided by magnetic path length.
- In vacuum, magnetic field strength of 1 Oe is equivalent to magnetic flux density of 1 gauss.
- The unit was established by the IEC in 1930 [1] in honour of Hans Christian Ørsted, who discovered electromagnetism in 1820.
- ^ a b Fink,Donald (1969). Standard Handbook For Electrical Engineers. McGraw-Hill. ISBN 0-07-020973-1
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