I am having difficulties with the following problem. I have gotten parts (a) and (b) (my correct answers are shown below), but I cannot figure out how to do part (c). Any help with it would be greatly appreciated. Thanks! ------------ The charges and coordinates of two charged particles held fixed in an xy plane are q1 = +3.5 µC, x1 = 4.0 cm, y1 = 0.50 cm, and q2 = -4.0 µC, x2 = -2.0 cm, y2 = 1.5 cm. (a) Find the magnitude of the electrostatic force on q2. Answer: 34.05N (b) Find the direction of this force. Answer: 350.54° (counterclockwise from the +x axis) (c) At what coordinates should a third charge q3 = +5.0 µC be placed such that the net electrostatic force on particle 3 due to particles 1 and 2 is zero?