Guiding center
（重定向自Polarization drift）
![Charged particle drifts in a homogeneous magnetic field. (A) No disturbing force (B) With an electric field, E (C) With an independent force, F (e.g. gravity) (D) In an inhomogeneous magnetic field, grad H](/Images/godic/202502/03/Charged-particle-drifts.svg3749.png")
In physics, the motion of an electrically charged particle (such as an electron or ion in a plasma) in a magnetic field can be treated as the superposition of a relatively fast circular motion around a point called the guiding center and a relatively slow drift of this point. The drift speeds may differ for various species depending on their charge states, masses, or temperatures, possibly resulting in electric currents or chemical separation.