Problem: A 1.0- μm-diameter oil droplet (density 900 kg/m3) is negatively charged with the addition of 40 extra electrons. It is released from rest 2.0 mm from a very wide plane of positive charge, after which it accelerates toward the plane and collides with a speed of 3.3m/s.
Part A: What is the surface charge density of the plane?
Please show all work and steps to find the surface charge density of the plane.