Name: _______________________

Quiz 3

10/03/2005

Ch. 19

1) 3 charges are placed at the corners of a square with 2m sides: -2mC at bottom left, ‑4mC at the bottom right, and +3mC at the top left. Find the amount of work required to move the bottom left charge to the top right?

2) A 3mC charged sphere of mass 1.4 mg is fired straight up from a small gun at a speed of 24 m/s in a constant gravitational field g=9.8 m/s/s pointing downward and a constant electric field E. The charge moves straight up. After it has moved up 1.3 m, it stops.

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 fired and the point 1.3 m above?