Two point charges are located on the y axis as follows: charge
q1 = -1.80 nC at y1 = -0.500 m , and charge q2 = 1.90 nC at the
origin (y = 0).
What is the magnitude of the net force exerted by these two
charges on a third charge q3 = 9.00 nC located
at y3 = -0.200 m ?
Express your answer in newtons.