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## Homework Statement

Two point charges lie on the x axis. A charge of +8.4 µC is at the origin, and a charge of -3.8 µC is at x = 10.0 cm.

At what position x would a third charge q3 be in equilibrium?

## Homework Equations

F=(kq1 q2)/r^2

## The Attempt at a Solution

I think that my main problem was that I wasn't quite sure how to solve for the distance if I don't have the charge for the third particle or its relation to the other charges.