_{g}=mg, where g=9.81 m/s

^{2}--acceleration due to gravity, m is the mass of the droplet. It can be found by the formula:

^{3}is the density of water. Volume of a droplet is the volume of a sphere of radius R=0.018mm=1.8*10

^{-5}m. V=4/3πR

^{3}; Final formula for the force of gravity is as follows:

_{g}=(4/3)ρπR

^{3}g

_{ }

_{e}. It can be found as F

_{e}=Eq, where E is the electric field, q is the charge. Overall charge equals the charge of one electron, e, (e=1.6*10

^{-19}C) times the number or excess electrons, N. So, electric force is:

_{e}=EeN

^{3}g=eEN

^{3}g/(eE)