3. A +4.0 gC-point charge and a -4.0-gC point charge are placed as shown in the figure. What is the potential difference, VA - VB, between points and B? (k = 1/41rco = 8.99 x 109 N m2/C2) A I OAOm A) 48 V B) 96 V C) 0.00 v D) 96 kV E) 48 kV 4. In a certain region, the electric potential due to a charge distribution is given by the equation = 2ry - - y, where x and y are measured in meters and V is in volts. At which point is the electric field equal to zero? = 1m, m C) x = 1 m, y 0.5 m 0.5 m, y 0.5m