Four point charges of equal magnitude are arranged at the corners of a square as shown in the gure. Positive charges are indicated by '+' and negative charges are indicated by Select the only true statement about the electric po- tential at points a, b and c. 3. AC) The electric potential equals zero at points a and b, but not at point e. BC) The electric potential equals zem at point b, but not at points a and c. CO The electric potential equals zero at points b and c, but not at point a. DO The electric potential equals zero at none of these points. E0 The electric potential equals zero at points a, b and c. F0 The electric potential equals zero at point c, but not at points a and b. G0 The electric potential equals zero at points a and (3, but not at point b. HQ The electric potential equals zero at points a, but not at points I) and c. What is the direction of the electric eld at point e? 4. A0 Up (to the top of the page). BO To the right. CO Down (to the bottom of the page). DO To the left E0 The electric eld is zero at this point