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## Homework Statement

Particles of charge q and 3q are placed 90m away from each other. A third particle is place in between them and the total electric force on this particle is zero. Determine the position of this particle.

## Homework Equations

F(E)=(k)(q1)(q2)/(r^2)

## The Attempt at a Solution

http://imgur.com/41Ngn8o

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After using the quadratic formula, I get stuck with two answers and I'm sure neigh ter of them are correct. Maybe the negative sign in the forces equation is unnecessary? Thanks