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Two charged particles, Q1 = + 12.0 mC and Q2 = -5.0mC, are placed at different...

Two charged particles, Q1 = + 12.0 mC and Q2 = -5.0mC, are placed at different points on a line. At what finite locations along the line may the electric potential be equal to zero?
I. in between the particles, closer to the positive particle
II. in between the particles, closer to the negative particle
III. not in between, but closer to the positive particle
IV. not in between, but closer to the negative particle
V. It can never be zero.
A. I only
B. II only
C. V only
D. I and IV
E. II and IV

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