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## Homework Statement

In the figure, four particles form a square. The charges are q1 = q4 = Q and q2 = q3 = q.

(a) What is Q/q if the net electrostatic force on particles 1 and 4 is zero?

## Homework Equations

F=8.99E9 Nm^2/c^2 [abs(q1)abs(q2)]/r^2

## The Attempt at a Solution

I made up some values to help make solving the problem easier

Q=1 r=1

the force on particle 1 due to particle 4 F14 = 8.99E9 [(1)(1)]/(sqrt 2)^2=4.495E9 N away from 4

the force from particle 2 would have to be cos(45)x4.495E9N toward 2 which would make q 5.946E-1c

so Q/q would be 1.68

is this correct?