Two charged parallel plates are at a distance of 180 mm from each other. The potential difference between them is 3600 V. a) If a small oil drop (m = 10-6 kg), carrying a charge of 6·10-9 C, is placed between the plates at point X (at the middle of the plates), calculate the magnitude and direction of the electrostatic force exerted on the droplet. (b) If the droplet is now moved to point Y which is closer to the negative charged plate by 30 mm, what would be its velocity and the work done by electric field? Consider that gravity force is negligible.