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. Thus, for example, Earth possesses an enormous magnetic moment, however we are very distant from its center and so we experience only a tiny magnetic flux density (measured in tesla) on its surface.

Knowing the magnetic moment of an object ($\mathbf {m}$) and the distance from its centre ($r$) it is possible to approximate the magnetic flux density experienced on the surface using the following formula:

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

Examples

Magnetic moment strength (from lower to higher orders of magnitude)

Factor (m2⋅A)	Value	Item
10−27	9284.764×10−27 m2⋅A	Magnetic moment of a positron
	4.3307346×10−26 m2⋅A	Magnetic moment of a deuterium nucleus
10−26	1.4106067×10−24 m2⋅A	Magnetic moment of a proton
10−24	9.2740100783(28)×10−24 m2⋅A	Bohr magneton
10-3	7.909×10−3 m2⋅A	Neodymium Iron Boron disc in a typical mobile phone
10-1	4.824×10−1 m2⋅A	Neodymium Iron Boron (strongest grade) disc the same size as a US Penny
103	5.937×103 m2⋅A	A bowling ball made of Neodymium Iron Boron (strongest grade)
1019	4×1019 m2⋅A	Mercury's magnetic field
1020	1.32×1020 m2⋅A	Ganymede's magnetic field
1022	6.4×1022 m2⋅A	Earth's magnetic field
1025	4.6×1025 m2⋅A	Saturn's magnetic field
1024	2.2×1024 m2⋅A	Neptune's magnetic field
	3.9×1024 m2⋅A	Uranus's magnetic field
1027	1.55×1027 m2⋅A	Jupiter's magnetic field
1028	1×1028 m2⋅A	Magnetic moment of a star or, equivalently, a white dwarf or a magnetar
1029	1×1029 m2⋅A
1030	1×1030 m2⋅A

See also

• Orders of magnitude (magnetic flux density)