Part I.Bookmarks 1&2 : Spinning Particle Model of the electron with the Center of Charge (CC,
r
) moving at speed |
u
| = c .
The Center of Mass (CM,
q
) moves at the speed

v
, with |

v
| < c.
The figures are modeled in Mathematica with the equations and code provided in Part I.Section 20 and bookmarked in the Manipulate plots with the referred numbers (1. and 2.).
A uniform or an oscillating electric field produces a force on the electron that accelerates the path of its center of mass but seems not to affect the evolution of the CM spin
S
CM
, that remains almost constant. A magnetic field produces the precession of the
S
CM
with the Larmor angular velocity, and this spin precesses backwards, in the opposite direction to the angular velocity of the CM motion, such that when the CM has given two turns the spin comes back to its initial orientation. In the interaction with an oscillating magnetic field, each time the magnetic field reverses, the angular velocity of the CM reverses and also the Larmor angular velocity of the center of mass spin.