# Oersted

megagauss oerstedsOeOERSTEDSmaximum energy productmegagauss-oersteds (MG&middot;Oe)MG·Oe
The oersted (symbol Oe) is the unit of the auxiliary magnetic field H in the centimetre–gram–second system of units (CGS).wikipedia
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### Gauss (unit)

gaussGkG
In the CGS system, the unit of the H-field is the oersted and the unit of the B‑field is the gauss.
According to the system of Gaussian units (cgs), the gauss is the unit of magnetic flux density B and the equivalent of Mx/cm 2, while the oersted is the unit of magnetizing field H.

### Centimetre–gram–second system of units

CGScgs unitsCGS unit
The oersted (symbol Oe) is the unit of the auxiliary magnetic field H in the centimetre–gram–second system of units (CGS).  It is equivalent to 1 dyne per maxwell.
For instance electric field strength is in units of volts per centimetre, magnetic field strength is in oersteds and resistivity is in ohm-cm.

### Hans Christian Ørsted

ØrstedHans Christian OerstedH.C. Ørsted
The unit was established by the IEC in 1930 in honour of the Danish physicist Hans Christian Ørsted.
Oersted's law and the oersted (Oe) are named after him.

### Tesla (unit)

teslaTteslas
In the SI system, the unit ampere per meter (A/m), which is equivalent to newton/weber, is used for the H‑field and the unit of tesla is used for the B‑field.
For the relation to the units of the magnetising field (ampere per metre or Oersted), see the article on permeability.

### Magnetic field

magnetic fieldsmagneticmagnetic flux density
In the CGS system, the unit of the H-field is the oersted and the unit of the B‑field is the gauss. The oersted (symbol Oe) is the unit of the auxiliary magnetic field H in the centimetre–gram–second system of units (CGS).  It is equivalent to 1 dyne per maxwell.
-field is measured in amperes per metre (A/m) in SI units, and in oersteds (Oe) in cgs units.

### International System of Units

SISI unitsSI unit
The oersted is 1000/4π (≈79.5774715) amperes per meter, in terms of SI units.

### Gaussian units

Gaussiancgs-Gaussian unitsGaussian-cgs units

### Dyne

dyndyne-centimeters
The oersted (symbol Oe) is the unit of the auxiliary magnetic field H in the centimetre–gram–second system of units (CGS).  It is equivalent to 1 dyne per maxwell. The oersted is defined as a dyne per unit pole.

### Maxwell (unit)

maxwellMx
The oersted (symbol Oe) is the unit of the auxiliary magnetic field H in the centimetre–gram–second system of units (CGS).  It is equivalent to 1 dyne per maxwell.

### Newton (unit)

kNnewtonN
In the SI system, the unit ampere per meter (A/m), which is equivalent to newton/weber, is used for the H‑field and the unit of tesla is used for the B‑field.

### Weber (unit)

weberWbwebers
In the SI system, the unit ampere per meter (A/m), which is equivalent to newton/weber, is used for the H‑field and the unit of tesla is used for the B‑field.

### International Electrotechnical Commission

IECInternational Electrotechnical Commission (IEC)(IEC)
The unit was established by the IEC in 1930 in honour of the Danish physicist Hans Christian Ørsted.

### Denmark

DanishKingdom of DenmarkConstituent country
The unit was established by the IEC in 1930 in honour of the Danish physicist Hans Christian Ørsted.

### Magnetic moment

magnetic dipole momentmagnetic momentsdipole moment
The oersted is defined as a dyne per unit pole.

### Solenoid

solenoidselectromechanical solenoidmagnetizing current loop
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.

### Ampere

AmAamp
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.

### Magnetomotive force

MMF
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:

### Force between magnets

Ampere model of magnetizationAmpere's model of magnetization

### Coercivity

coercive fieldmagnetic coercivitycoercive force
Coercivity is usually measured in oersted or ampere/meter units and is denoted H C.

### Floppy disk format

DSSoft sectoringdisk format
Different floppy disk types had different recording characteristics, with varying magnetic coercivity (measured in oersteds, or in modern SI units in amperes per meter), ferrite grain size, and tracks per inch (TPI).

### Neodymium magnet

neodymium magnetsneodymiumSupermagnet
Therefore, as the maximum energy density is proportional to J s 2, this magnetic phase has the potential for storing large amounts of magnetic energy (BH max ≈ 512kJ/m 3 or 64MG·Oe).