In the figure is shown a distribution of three charges:

• A positively charged ring of charge +Q and radius R, lying in the x-y-plane centered on the origin.

A small positively charged sphere with the same charge as the ring, +Q, and sitting on the y-axis at x = 0, y = R, z = 0. A negatively charge point charge, -q, sitting on the z-axis a distance d from the origin. Calculate the magnitude of the total force on the point charge, -q, due to the ring and sphere charges. Let: Q = 9.27 x 106 C, q = 7.12 x 10 C, R = 2.00 x 102 m, d = 1.77 x 10 m Give your answer in Newtons, to at least 3 significant digits. Do not include units in your answer. X -q +Q, R +Q