Two charges are located at opposite corners (A and C) of a square. We do not know

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Two charges are located at opposite corners (A and C) of a square. We do not know the magnitude or sign of these charges. What can be said about the potential at corner B relative to the potential at corner D?

(a) It is the same as that at D.
(b) It is different from that at D.
(c) It is the same as that at D only if the charges at A and C are equal.

(d) It is the same as that at D only if the charges at A and C are equal in magnitude and opposite in sign.

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