# Definition:Magnetic Field Strength

## 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

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

### Dimension

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

### Units

The SI unit for magnetic field strength is given as amperes per metre:

$\mathrm A \, \mathrm m^{-1}$

## Also see

• Results about magnetic field strength can be found here.