MAGNETIC FIELD UNITS CONVERSION

DEFINITIONS, ONLINE CALCULATORS, EQUATIONS

Magnetic field is one of two components of electromagnetic field. It is a region where forces acting on moving electric charges can be detected. Magnetic fields are created by moving electric charges or variable electric field. The charge movement that creates magnetic field may be macroscopic (currents in conductors), or microscopic (associated with spin and orbital motion of electrons, resulting in "magnetic materials").
The SI unit for magnetic flux is the weber (Wb). If the flux changes by 1 Wb over a time of 1s, then a voltage of 1 V is induced in a conductive loop encircling it: 1 Wb = 1 Vs.
The SI unit for magnetic flux density (induction) B is tesla (T): 1 T = 1 Wb/m2 = 1 Vs/m2.
Magnetic field with density of 1 T generates one newton of force per ampere of current per meter of conductor.
When the magnetic fields generated by currents pass through some materials they can produce magnetization in the direction of the applied field. In ferromagnetics it results in increased total field B. Quantity called magnetic field strength (or magnetizing force) H is a measure of the applied magnetic field from external currents, independent of the material's magnetic response. Quantity called magnetization M defines the material's response- it is magnetic moment per unit volume of material. Flux density (magnetic induction) B describes the resulting field in the material. In power electronics it is the main quantity used in calculation of the minimum required cross-sectional area of power transformer cores (see also: Power Transformer electrical engineering reference info).
The table below provides the equations in both SI and CGS systems and conversion factors of magnetic units.