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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?