  The charge density of vector particles, for example W, may change sign. The
effect manifests itself even for a free propagation; when the energy of the
W-boson is higher than sqrt{2}m and the standing-wave is considered the charge
density oscillates in space. The charge density of W also changes sign in close
vicinity of a Coulomb center. The dependence of this effect on the g-factor for
an arbitrary vector boson, for example rho-meson, is discussed. An origin of
this surprising effect is traced to the electric quadrupole moment and
spin-orbit interaction of vector particles. Their contributions to the current
have a polarization nature. The charge density of this current, rho = -\nabla
\cdot P, where P is an effective polarization vector that depends on the
quadrupole moment and spin-orbit interaction, oscillates in space, producing
zero contribution to the total charge.
