When you are painting a car with a sprayer, you get more even coverage (the paint droplets are evenly spread out) and less overspray (there are very few droplets of paint that don’t end up on the vehicle) if you give the droplets a strong electric charge.

a. why does charging the droplets give more even coverage?
b. why does charging the droplets ensure that most of the paint ends up on the car?

PART A) To give an approximation to the microscopic behavior of the drops, we must refer to Coulomb's law for which it is warned that similar charges repel. This spraying technique is used because when it starts to spray and expel the drops, they leave with the same loads and will be repelled, causing the layer of drops to be thinner and not thick drops. The lack of conglomeration of large drops will cause the paint to be finer.

PART B) When the object is loaded differently, even if the paint is shot in a different direction, it will end up adhered to the body by the action of this attraction