Consider the following figure. 8.00 C + y 2.00 . 4.00 C @ (a) Find the electric potential, taking zero at infinity, at the upper right corner (the corner without a charge) of the rectangle in the figure. (Let x = 5.40 cm and y = 2.20 cm.) Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. V (b) Repeat.if.the.2.00-uc charge is replaced with a charge of -2.00 C. Enter a number. differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. V