An oil droplet is sprayed into a uniform electric field of adjustable magnitude. The 0.04g droplet hovers motionless (gravity force equalling electrostatic force) when the electric field is set to 370N/C and directed downward. a. Determine the sign and magnitude of the charge on the oil droplet. b. Determine the approximate number of excess electrons that are on the oil droplet. c. Determine the voltage required to create this electric field between the parallel plates, if the plates are positioned 30cm apart with one on top of the other.

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