Question: there is a naturally occurring vertical electric field near the...

There is a naturally occurring vertical electric field near the Earth’s surface that points toward the ground. In fair weather conditions, in an open field, the strength of this electric field is 90.0 N/C90.0 N/C . A spherical pollen grain with a radius of 10.0 μm10.0 μm is released from its parent plant by a light breeze, giving it a net charge of −0.800 fC−0.800 fC (where 1 fC=1×10−15 C1 fC=1×10−15 C). What is the ratio of the magnitudes of the electric force to the gravitational force, 𝐹electric/𝐹gravFelectric/Fgrav , acting on the pollen? Pollen is primarily water, so assume that its volume mass density is 1000 kg/m31000 kg/m3 , identical to the volume mass density of water.