The corners of a square are labelled as A, B, C, and D. Two charges are located at opposite corners of a square (at points B and D). We do not know the magnitude or signs of these two charges. How does the electric potential at point A relate to the electric potential at point C. (a) V at point A is the same as V at point C.  (b) V at point A is the different from V at point C.  (c) V at point A is the is the same as V at point C only if the  charges are equal and have the same sign.  (d) V at point A is the is the same as V at point C only if the  charges are equal and have the opposite sign.

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Electric Charges and Fields

One of the fundamental properties is the electromagnetic property. Charge cannot be destroyed by any process and this contributes formally to the law of charge conservation.