Potential:

$\overline{){\mathbf{V}}{\mathbf{=}}\frac{\mathbf{k}\mathbf{q}}{\mathbf{r}}}$

Since the potentials are scalars, we just add them directly.

We'll need to find the diagonal of the square to get r between point A and charge - 30.6μC.

H = sqrt (20.1^{2} + 20.1^{2}) = 28.4 cm

Pictured on the right are thee point charges Q1 = 21.4 μC, Q2 = -30.6 μC, and Q3 = 57.3 μC arranged according to the figure on the right. Calculate the potential at point A in the figure.

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