French
DeutschOrders 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 () and the distance from its centre () it is possible to calculate the magnetic flux density experienced on the surface () using the following approximation:
- ,
where is the constant of vacuum permeability.
Examples
[edit]| Factor (m2⋅A) | Value | Item |
|---|---|---|
| 10−27 | 4.3307346×10−27 m2⋅A | Magnetic moment of a deuterium nucleus |
| 10−26 | 1.4106067×10−26 m2⋅A | Magnetic moment of a proton |
| 10−24 | 9.284764×10−24 m2⋅A | Magnetic moment of a positron |
| 9.274…×10−24 m2⋅A | Bohr magneton | |
| 10-11 | 1.5×10−11 m2⋅A[1] | Magnetic field of the human brain |
| 3.75×10−11 m2⋅A[1] | ||
| 10-3 | 7.909×10−3 m2⋅A[2] | Neodymium-iron-boron disc in a typical mobile phone |
| 10-1 | 4.824×10−1 m2⋅A[2] | Neodymium-iron-boron (strongest grade) disc the same size as a US Penny |
| 103 | 5.937×103 m2⋅A[2] | A bowling ball made of neodymium-iron-boron (strongest grade) |
| 1019 | 4×1019 m2⋅A[3] | Magnetic field of Mercury |
| 1020 | 1.32×1020 m2⋅A[3] | Magnetic field of Ganymede |
| 1022 | 6.4×1022 m2⋅A[4] | Earth's magnetic field |
| 1024 | 2.2×1024 m2⋅A[3] | Magnetic field of Neptune |
| 3.9×1024 m2⋅A[3] | Magnetic field of Uranus | |
| 1025 | 4.6×1025 m2⋅A[3] | Magnetic field of Saturn |
| 1027 | 1.55×1027 m2⋅A[3] | Magnetic field of Jupiter |
| 1028 | 1×1028 m2⋅A | Magnetic moment of a star or, equivalently, a white dwarf or a magnetar[5] |
| 1029 | 1×1029 m2⋅A | |
| 1030 | 1×1030 m2⋅A[6] |
References
[edit]- ^ a b Gilder, Stuart A.; Wack, Michael; Kaub, Leon; Roud, Sophie C.; Petersen, Nikolai; Heinsen, Helmut; Hillenbrand, Peter; Milz, Stefan; Schmitz, Christoph (2018). "Distribution of magnetic remanence carriers in the human brain". Scientific reports. 8 (11363). doi:10.1038/s41598-018-29766-z.
- ^ a b c "What is the MAGNETIC MOMENT?". Adams Magnetic. Retrieved 2024-07-24.
- ^ a b c d e f Durand-Manterola, Hector Javier (2010-07-26). "Dipolar Magnetic Moment of the Bodies of the Solar System and the Hot Jupiters". arXiv:1007.4497.
- ^ "Earth's Magnetic Field". Harvard University. Retrieved 2024-07-24.
- ^ Magnetars have enormous magnetic flux densities on their surfaces due to the small radius, however the total magnetic field of the original star does not increase during the collapse, but actually decreases with time.
- ^ Toropina, O. D.; Romanova, M. M.; Lovelace, R. V. E. (2006). "Spinning-down of moving magnetars in the propeller regime". Monthly Notices of the Royal Astronomical Society. 371 (2): 569–576. doi:10.1111/j.1365-2966.2006.10667.x.
See also
[edit]
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