Four point charges form a square with sides of length d, as shown in the figure. In the questions that follow, use in place of the constant (Figure 1) 4TED Part A What is the electric potential Vtot 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) kq Vtot = 10 kd Figure +9 d -39 + + +2q +5q 1 of 1 Submit Previous Answers Correct Part B What is the contribution U2 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) ? U2q= Submit Previous Answers Request Answer Incorrect; Try Again; 3 attempts remaining Your answer either contains an incorrect numerical multiplier or is missing one. Part C What is the total electric potential energy Utot of this system of charges? Express your answer in terms of q, d, and appropriate constants. View Available Hint(s) Utot = Submit Part D Complete previous part(s) Part E Complete previous part(s) Provide Feedback ? P Pearson