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
- 1921: C.E. Weatherburn: Elementary Vector Analysis ... (previous) ... (next): Chapter $\text I$. Addition and Subtraction of Vectors. Centroids: Definitions: $1$. Scalar and vector quantities
- 1969: J.C. Anderson, D.M. Hum, B.G. Neal and J.H. Whitelaw: Data and Formulae for Engineering Students (2nd ed.) ... (previous) ... (next): $1.$ Units and Abbreviations: $1.2$ SI units $(2)$ Derived units
- 1970: George Arfken: Mathematical Methods for Physicists (2nd ed.) ... (previous) ... (next): Introduction: Electromagnetic Theory