A charge Q is placed at the origin O(0, 0, 0) in vacuum. Calculate the potential at point (4, 4, 4) if: a) V = 0 at infinity; b) V 0 at point (20, 20, 20) and c) V = 15 V at (2,2,2). The magnitude of the charge Q and the location of the point P, A and B are self-determined
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