  An exact calculation of the retarded electric field in the source region of a
system of individual charges, expanded to third order in velocity, shows that
all nonrelativistic accelerated charges in a system emit dipole electromagnetic
energy at the Larmor rate. In general, some of the emitted dipole power is
reabsorbed by doing work on other charges in the system, and some is radiated.
If the system has zero net dipole moment, all the emitted dipole power is
reabsorbed, and none is radiated.
