1) 3 charges are placed at the corners of a square with 1m sides: -1mC at bottom left, +3mC at the bottom right, and -2mC at the top left. Find the amount of work required to move the bottom left charge to infinity?
2) A +2mC charged sphere of mass 0.12 mg is released from rest in a constant gravitational field g=9.8 m/s/s pointing downward and a constant electric field E. The charge falls straight down. After it has fallen 1.0 m, it has a speed of 1.8 m/s.
a) What is the magnitude and direction of the Electric Field?
b) What is the potential difference between the point from which the charge was released and the point 1.0 m below?