In Figure six charged particles surround particle 1 at radial distances of either d = 1.0 cm or 2d, as drawn. The charges are q1 = + 2e, q2 = + 4e, q3 = + e, q4 = + 43, q5 = + 2e, q6 = + 8e, q7 = + 6e, with e = 160 x 10-19 C. What is the magnitude of the net electrostatic force on particle 7?

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