Two point charges are fixed in place, as in Figure 19.9.
Chapter 19, Problem 19.110(choose chapter or problem)
Two point charges are fixed in place, as in Figure 19.9. The positive charge is 2q and has twice the magnitude of the negative charge, which is q. On the line that passes through the charges, three spots are identified, P1, P2, and P3. At which of these spots could the potential be equal to zero? (a) P2 and P3 (b) P1 and P3 (c) P1 and P2
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