  Evolution of spin polarization in the presence of external electric field is
studied for collision energies $\sqrt{s_{\rm NN}}=27\,{\rm GeV}$ and
$\sqrt{s_{\rm NN}}=200\,{\rm GeV}$. The numerical analysis is done in the
perfect-fluid Bjorken-expanding resistive magnetohydrodynamic background and
novel results are reported. In particular, we show that the electric field
plays a significant role in the competition between expansion and dissipation.
