Problem 3: Two positive point charges, Q > 0, are located at the two left corners of a square; and two negative point charges, -Q < 0, are located at the two right corners of that square, as shown in figure below. The electric potential, V, generated by these four charges, is zero at infimite distance from the square. The points R, S, T, and U are the mid-points of the edges and M is the center of the square; and the potential values at these five points are denoted by VR, Vs, VT, VU and VM, respectively. Which of the following is true? -Q У R (+ -Q (A) VR = Vs = Vr = VỤ = 0 and VM > 0. (B) VT = VỤ > 0 and VR = Vs < 0 and VM = 0. (C) VR = VT = 0 and Vs = Vu = Vm > 0. (D) Vy = Vs = VM = 0 and Vr = –VR > 0. (I. Vs = Vu = VM = 0 and VR = -VT > 0. |3D

Problem 3: Two positive point charges, Q > 0, are located at the two left corners of a square; and two negative point charges, -Q < 0, are located at the two right corners of that square, as shown in figure below. The electric potential, V, generated by these four charges, is zero at infimite distance from the square. The points R, S, T, and U are the mid-points of the edges and M is the center of the square; and the potential values at these five points are denoted by VR, Vs, VT, VU and VM, respectively. Which of the following is true? -Q У R (+ -Q (A) VR = Vs = Vr = VỤ = 0 and VM > 0. (B) VT = VỤ > 0 and VR = Vs < 0 and VM = 0. (C) VR = VT = 0 and Vs = Vu = Vm > 0. (D) Vy = Vs = VM = 0 and Vr = –VR > 0. (I. Vs = Vu = VM = 0 and VR = -VT > 0. |3D