  From non-linear modification of Maxwell-Einstein theory, considered in
(physics/9801031), follows modified Coulomb law for interaction between charged
objects. Namely, if $(m, e)$ and $(m', e')$ are masses and charges of two
objects, then the potential energy of interaction, $V(r) = [ee' - kmm' -
\sqrt{k}(em' + e'm)]/r $, where $k$ is Newtonian constant. It follows, that the
Earth should possess negative electric charge, $Q_E = - \sqrt{k} M_E$. Obtained
result explains, why do primary cosmic rays consist mainly of positive charges.
