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## Homework Statement

Four positive charges are located on the corners of a square of side-length a.

The charges are A=4, B=2, C=8

4q----a----q

|------------|

a-----------a

|------------|

2q----a----8q

Determine the magnitude and direction of the electric field experienced by charge q in terms of q, a, and k

_{e}.

## Homework Equations

E

_{x}= [q

_{1}*q

_{2}/(4*∏*ε

_{o}*a^2)]cosθ

E

_{y}= [q

_{1}*q

_{2}/(4*∏*ε

_{o}*a^2)]sinθ

## The Attempt at a Solution

Ex = 4keq

^{2}/a^2 + 2keq

^{2}/[(2a

^{2})^.5]cos45

Ey = [2keq

^{2}/(a*2

^{1/2})]sin45 + 8keq

^{2}/a

^{2}

I know I have to sum up the x components from A->q and B->q for the x component of the vector, and then sum up the y components from B ->q and C->q for the y component and then use the pythagorean theorum to find the magnitude. For the direction I have to take the tangent of the y-component/x-component. I am just confused because there aren't any values given. Would the above be correct?