A water droplet with mass of 4 x10-5 kg floats in midair due to a balance of gravitational forces and electric forces acting on charges in the water droplet. The electric field of the Earth in the region of the droplet is 250 N/C. We want to determine the amount of excess electrons the droplet has.
Determine the electric force acting on this droplet, explaining your reasoning.

b. Using your answer to part A, calculate the amount of charge on the rain droplet. (3 points)
C. Using your answer to part B, determine how many excess electrons are in this water droplet.