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## Homework Statement

There are 3 charges, each denoted q, the first at (0,a), the second at (0,0) and finally one at (b,0). What is the resultant electric field at point P, (b,a)?

## Homework Equations

E[/B]=q/(4πεo r

^{2}) for a point charge

## The Attempt at a Solution

So I know I need to use the superposition principle and sum the fields caused by the individual charges but I'm not sure whether I need to consider the fact that their fields wont necessarily be in the same direction.

My attempt gave me

E= q/(4πεo (1/a

^{2}+ 1/b

^{2}+ 1/(a

^{2}+ b

^{2})) in the direction the same as sqrt(a

^{2}+ b

^{2}).

Thanks for any help, I've been debating this with friends.