The charges and coordinates of two charged particles held fixed in an xy plane are q1 = 2.91 μc, x 1 = 2.72 cm, y1 = 0.117 cm and q2 = -6.17 μc, x2 = -2.86 cm, y2 = 2.17 cm. find the (a) magnitude and (b) direction (with respect to +x-axis in the range (-180°; 180°]) of the electrostatic force on particle 2 due to particle 1. at what (c) x and (d) y coordinates should a third particle of charge q3 = 3.90 μc be placed such that the net electrostatic force on particle 2 due to particles 1 and 3 is zero