# Electric field point charges

## Homework Statement

Two points are resting on a string. The first point is resting at x = 6.0 m and has charge q1 =−7.1 µC. The second point is resting at x = −4.0 m and has charge q2 = −4.3 µC.
At what location is the total electric field zero from the two points(other than infinity)?

## Homework Equations

$$E =\frac{KQ}{r^2}$$

$$\frac{q_1}{r_1^2} = \frac{q_2}{r_2^2}$$

## The Attempt at a Solution

I divided away the constant K from my second equation because they cancel out when you set them equal to each other.

I don't know what my $$r_1,r_2$$ should be here?