Example 1 The charges and coordinates of two charged particles held fixed are q1 = +3 JC, (3.5 cm, 0.5 cm), and q2 = -4 HC, (-2.0 cm, 1.5 cm). a. Find the magnitude and direction of the electrostatic force on particle 2 due to particle 1? b. At what x and y coordinates should a third particle of charge q3 = +4 JC be placed such that the net electrostatic force on particle 2 due to particles 1 and 3 is zero