Figure 1: 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.

15. Second section: Dynamic equations

The Center of Mass is accelerated with the influence of external electric and magnetic fields, it moves according to equation (3):

v
t
=
2


2
t
q
=
e
mγ(v)
E
+
u
×
B
-
1
2
c
v

E
+
u
×
B

v

(
1
)
and the remaining equations are the same as in the free case :