Question

4. Four charges are located at the corners of a rectangle: qi -3pC at (0,0), q2 +2 μC at (3,0), g,- 5pC at (3, 2), q4+1 C' at (0,2) (a) Find the total electrostatic energy U of the system in J and in eV. (b) Calculate the potential V and the E-field at the center of the rectangle. (c) What energy is needed to bring q8 C to the center of the rectangle? What force will act on this charge?

I have the answers but not the steps. Would someone mind including the steps?

Answers:

a) u = -0.049 J = -3.1 X 10^17 eV

b) V(1.5, 1.0) = -25,000 V E= (2310, 4626) N/C

c) 0.2 J,    F = (-0.018, -0.037) N

Answer 1