Definition:Magnetic Field Strength

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Definition

Magnetic field strength is the measure of the intensity of a magnetic field.

It can be expressed as:

$\mathbf H = \dfrac {\mathbf B} \mu$

where:

$\mathbf B$ is the magnetic flux density
$\mu$ is the permeability of the medium.

It is a vector quantity.


Symbol

$\mathbf H$

The usual symbol used to denote magnetic field strength is $\mathbf H$.


Its $\LaTeX$ code is \mathbf H .


Dimension

Magnetic field strength has the dimension $\mathsf {I L}^{-1}$.


Units

The SI unit of magnetic field strength is the ampere turn per metre.

In the CGS unrationalised electromagnetic system, the unit of magnetic field strength is the oersted.


Conversion Factors

\(\ds \) \(=\) \(\ds 1\) ampere turns per metre
\(\ds \) \(\approx\) \(\ds 4 \pi \times 10^{-3}\) oersted (or e.m.u. of magnetic field strength)
\(\ds \) \(\) \(\ds 3 \times 10^9\) e.s.u. of magnetic field strength


Also known as

Magnetic field strength is also known as:

  • Magnetic field intensity
  • Magnetizing force


Also see

  • Results about magnetic field strength can be found here.


Sources