This file is from Wikimedia Commons and may be used by other projects.
The description on its file description page there is shown below.
Summary
DescriptionPrecession in magnetic field.svg
English: The magnetic moment of a nucleus precesses around the direction of an external magnetic field (green). The direction of the precession depends on the sign of the gyromagnetic ratio, γ. Here the precession is depicted for nuclei with γ > 0 (e.g. protons).
Deutsch: Das magnetische Moment eines Atomkern präzidiert um die Achse eines externen Magnetfeldes (grüne). Die Rotationsrichtung hängt vom Vorzeichen des kernspezifischen gyromagnetischen Verhältnis, γ, ab. Die Darstellung zeigt die Rotationsrichtung für γ > 0 (wie z.B. bei Protonen).
The person who associated a work with this deed has dedicated the work to the public domain by waiving all of their rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law. You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission.
http://creativecommons.org/publicdomain/zero/1.0/deed.enCC0Creative Commons Zero, Public Domain Dedicationfalsefalse
Captions
Precession of a nuclear magnetic moment in an external magnetic field.
Präzession des magnetischen Kernmoments in einem externen magnetischen Feld.