Part 2. Free-Response Questions Gentle reminder: sketch a diagram, whenever possible, to visualize the data and conditions given and help analyze relationships among them. 1. (8 points) As shown in the figure, point charges qi = -12.2 nc and q2 = +32.6 nC are located at +d/2 and -d on the y-axis as shown below. A third, unknown charge is located at -d on the x-axis. Take d = 8.00 cm. a) Find the amount and type of charge for qs so that the electric O d/2 93 P, potential at the origin is zero. b) Find the electric potential at location P, due to the 3 charges. -d c) A fourth charge, q4 = -15.0 nC, is placed at the origin. Find the amount of work needed to move q4 to location P1. Does this move - d increase or decrease the potential energy of the system? Explain your