# 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 ($\mathbf {m}$) and the distance from its centre ($r$) it is possible to calculate the magnetic flux density experienced ($\mathbf {B}$) using the following approximation:
    $\mathbf {B} \approx \mu _{o}{\frac {\mathbf {m} }{2\pi r^{3}}}$,
where $\mu _{o}$ is the constant of vacuum permeability.

## Examples

Magnetic moment strength (from lower to higher orders of magnitude) :
| Factor (m$^2$⋅A) | Value | Item |
| 10$^{−45}$ | 9.0877×10$^{−45}$ m$^2$⋅A | Unit of magnetic moment in the Planck system of units. |
| 10$^{−27}$ | 4.3307346×10$^{−27}$ m$^2$⋅A | Magnetic moment of a deuterium nucleus |
| 10$^{−26}$ | 1.4106067×10$^{−26}$ m$^2$⋅A | Magnetic moment of a proton |
| 10$^{−24}$ | 9.284764×10$^{−24}$ m$^2$⋅A | Magnetic moment of a positron |
| 10$^{−24}$ | 9.274…×10$^{−24}$ m$^2$⋅A | Bohr magneton |
| 10$^{−18}$ | 0.65–2.65 nm$^2$⋅A (1 nm$^2$⋅A = 10$^{−18}$ m$^2$⋅A) | Magnetic moment of individual magnetite nanoparticles (20 nm diameter) |
| 10$^{−11}$ | 1.5×10$^{−11}$ m$^2$⋅A | Magnetic field of the human brain |
| 10$^{−11}$ | 3.75×10$^{−11}$ m$^2$⋅A | Magnetic field of the human brain |
| 10$^{−5}$ | 7.99×10$^{−5}$ m$^2$⋅A | NIST YIG (yttrium iron garnet) standard 1 mm sphere for calibrating magnetometers (SRM #2852) |
| 10$^{−4}$ | 8.6×10$^{−4}$ m$^2$⋅A | Needle in a thumbnail-sized compass |
| 10$^{−3}$ | 7.909×10$^{−3}$ m$^2$⋅A | Neodymium-iron-boron disc in a typical mobile phone |
| 10$^{−1}$ | 0.1 m$^2$⋅A | Magnetic field of a typical refrigerator magnet |
| 10$^{−1}$ | 0.4824 m$^2$⋅A | Neodymium-iron-boron (strongest grade) disc the same size as a US Penny |
| 10$^0$ | 1.17 m$^2$⋅A | Neodymium-iron-boron N35 magnet of 1 cubic centimeter in volume |
| 10$^0$ | 1.42 m$^2$⋅A | Neodymium-iron-boron N52 magnet of 1 cubic centimeter in volume |
| 10$^3$ | 5.937×10$^3$ m$^2$⋅A | A bowling ball made of neodymium-iron-boron (strongest grade) |
| 10$^6$ | 5×10$^6$ m$^2$⋅A | Any magnet able to produce 1 tesla one metre away from its centre |
| 10$^{19}$ | 4×10$^{19}$ m$^2$⋅A | Magnetic field of Mercury |
| 10$^{20}$ | 1.32×10$^{20}$ m$^2$⋅A | Magnetic field of Ganymede |
| 10$^{22}$ | 6.4×10$^{22}$ m$^2$⋅A | Earth's magnetic field |
| 10$^{24}$ | 2.2×10$^{24}$ m$^2$⋅A | Magnetic field of Neptune |
| 10$^{24}$ | 3.9×10$^{24}$ m$^2$⋅A | Magnetic field of Uranus |
| 10$^{25}$ | 4.6×10$^{25}$ m$^2$⋅A | Magnetic field of Saturn |
| 10$^{27}$ | 1.55×10$^{27}$ m$^2$⋅A | Magnetic field of Jupiter |
| 10$^{28}$ | 1×10$^{28}$ m$^2$⋅A | Magnetic moment of a star or, equivalently, a white dwarf or a magnetar |
| 10$^{29}$ | 1×10$^{29}$ m$^2$⋅A | Magnetic moment of a star or, equivalently, a white dwarf or a magnetar |
| 10$^{30}$ | 1×10$^{30}$ m$^2$⋅A | Magnetic moment of a star or, equivalently, a white dwarf or a magnetar |