Violation of the center of mass theorem for systems with electromagnetic interaction

In this letter we show that for isolated systems for which the energy current density is not equal to the momentum density, that means for systems with non-symmetric energy-momentum, the usual statements of the center of mass motion theorem are not valid. We also discuss the modified version of the theorem that is always valid. Then we present a simple and exactly workable example of an electromagnetic interacting system which illustrates the violation of those standard versions of the center of mass motion theorem. We show that for this system Minkowski's density of linear momentum which yields a non-symmetric electromagnetic energy-momentum tensor, but not Abraham's, is compatible with total momentum conservation.