Coulomb's law:

$\overline{){\mathbf{F}}{\mathbf{=}}\frac{\mathbf{k}{\mathbf{q}}_{\mathbf{1}}{\mathbf{q}}_{\mathbf{2}}}{{\mathbf{r}}^{\mathbf{2}}}}$, where k is Coulomb constant and r is the separation between q_{1} and q_{2}.

Let's visualize this problem in a diagram:

Let the forces be acting on the charge at position 4.

F_{3} = - kQ^{2}/L^{2}

The x-component of the electric force on charge 4 due to charge 2 is given by:

Four identical charges Q are placed at the corners of a square of side L.

Find the magnitude total force exerted on one charge by the other three charges.

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