Point charges e, 5e, -3e, and 2e are placed, one at a time and proceeding clockwise, at the corners of a square whose sides measure 7.4 pm. What is the electric potential energy required to assemble this charge configuration? Give your answer in eV's, relative to a potential energy of zero defined as the energy of the configuration where all the charges are infinitely separated.

a. Sketch the situation, defining all your variables.

b. What physics equation(s) will you utilize in order to solve this problem? For each equation you list, give a justification for why it applies to this situation.

c. Apply your equation(s) to solve the problem as an algebraic expression(s).

d. Calculate your numerical answer(s). Show the units of your answer(s), and how you got them.