Orders of magnitude (magnetic moment)

This page lists examples of magnetic moments produced by various sources, grouped by orders of magnitude. The magnetic moment of an object is an intrinsic property and does not change with distance, and thus can be used to measure "how strong" a magnet is. For example, Earth possesses an enormous magnetic moment, however we are very distant from its center and experience only a tiny magnetic flux density (measured in tesla) on its surface.

Knowing the magnetic moment of an object (${\displaystyle \mathbf {m} }$) and the distance from its centre (${\displaystyle r}$) it is possible to calculate the magnetic flux density experienced (${\displaystyle \mathbf {B} }$) using the following approximation:

${\displaystyle \mathbf {B} \approx \mu _{o}{\frac {\mathbf {m} }{2\pi r^{3}}}}$,

where ${\displaystyle \mu _{o}}$ is the constant of vacuum permeability.