Monte Carlo method

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Oersted (abbreviated as Oe) is the unit of the auxiliary magnetic field H in the CGS system of units.

Difference between CGS and SI systems

In CGS the unit of H-field is the oersted and the unit of B‑field is the gauss. In the SI system, ampere per meter (A/m) is used for H‑field and tesla is used for B‑field.

History

The unit was established by the IEC in 1930 in honour of the Danish physicist Hans Christian Ørsted. Ørsted discovered the relationship between magnetism and electric current when a magnetic field produced in a current-carrying coil deflected an ammeter (an instrument used to measure current) when it was switched on and off.

Definition

The oersted is defined as a dyne per unit pole.Potter or Ceramic Artist Truman Bedell from Rexton, has interests which include ceramics, best property developers in singapore developers in singapore and scrabble. Was especially enthused after visiting Alejandro de Humboldt National Park. The oersted is 1000/4π (≈79.5774715) amperes per meter, in terms of SI units.

The H-field strength inside a long solenoid wound with 79.58 turns per meter of a wire carrying 1 A is approximately 1 oersted. The preceding statement is exactly correct if the solenoid considered is infinite in length with the current evenly distributed over its surface.

The oersted is closely related to the gauss, the CGS unit of magnetic flux density. In a vacuum, if the magnetizing field strength is 1 Oe, then the magnetic field density is 1 G, whereas, in a medium having permeability $\mu$_r (relative to permeability of vacuum), their relation is:

$B({\mbox{G}})=\mu _{r}H({\mbox{Oe}})$

Because oersteds are used to measure magnetizing field strength, they are also related to the magnetomotive force (mmf) of current in a single-winding wire-loop:

$H({\mbox{Oe}})={\frac {1000}{4\pi }}{\frac {I({\mbox{A}})}{l({\mbox{m}})}}$

The stored energy in a magnet, called magnet performance or maximum energy product (often abbreviated BH_max), is typically measured in units of megagauss-oersteds (MGOe). One MGOe is approximately equal to 7957.74715 J/m³.

See also

• Centimetre gram second system of units
• Ampere's model of magnetization

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References

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