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## Homework Statement

Here it goes.

2 pontual charges (Q>0), placed in (0,a,0) and (0,-a,0): calculate de vector E(x,0,0) along xx

## Homework Equations

## The Attempt at a Solution

I tried to use E=1/(4*pi*epsilon naught) * Q/r

^{2}

but when i make Q/(x ex + a ey)

^{2}and (x ex + (-a) ey)

^{2}

i don't know what to do...

(I think i have doing something wrong)

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