Two charges q = +8.0 µC are fixed a distance d = 9.0 cm apart.
(a) With V = 0 at infinity, what is the electric potential at point C?
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(b) You bring a third charge q = +8.0 µC from infinity to C. How much work must you do?
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(c) What is the potential energy U of the three-charge configuration when the third charge is in place?
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