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Consider a square of side 66 cm. Let one corner, point P, be charge-free, while the other three of the four corners have point charges at them. The corner opposite to (and most distant from) point P has charge Q = 69 nanocoulomb. The two corners nearer to P have charges +5Q and -4Q, respectively. Assuming that the potential V = 0 at a great distance, what is the potential (in volts) at point P?

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