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 (20.12 + 20.12) = 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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