In an oil-drop experiment, two parallel conducting plates are connected to a power supply which generates an electric field E whose field strength is 10,000 N/C. The separation between the plates is 0.01 m. A 4.8x10-16 kg oil drop is suspended in the region between the plates. Use g = 10 m/s. a. What is the sign and magnitude of the electric charge on the oil drop when it stays stationary? The mass of the drop is reduced to 3.2*10-16 kg because of vaporization. b. What is the acceleration of the drop?