Part A Four point charges form a square with sides of length d, as shown in the figure. In the questions that follow, use the constant k in place of (E What is the electric potential Vira at the center of the square? Make the usual assumption that the potential tends to zero far away from a charge. Express your answer in terms of q, d, and appropriate constants. View Available Hint(s) IVO AEd Viot Submit Part B What is the contribution Uzq to the electric potential energy of the system, due to interactions involving the charge 2q? Express your answer in terms of q, d, and appropriate constants. View Available Hint(s) Symbols U29 Submit Part C What is the total electric potential energy Utes of this system of charges? Express your answer in terms of 9, d, and appropriate constants. View Available Hint(s) AERO CO - ? Submit\f