  New experimental results and their physical analysis are presented to clarify
the behavior of a relatively stable self-arranged droplet cluster levitating
over the locally heated water surface. An external electric field of both
opposite directions leads to a significant increase in the rate of a
condensational growth of droplets in the cluster. The experimental data are
used to estimate a small electrical charge of single droplets and the
attraction force of polarized droplets to the water layer. It is confirmed that
the interaction between the droplets is governed by aerodynamic forces.
