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The electric potential at a position located a distance of 22.5 mm from a positive point charge of 8.3 nC and 11.1 mm from a second point charge of unknown charge is 1.29 kV. Calculate the value of the unknown charge in units of nC. HINT: Like electric field, the total electric potential at any position is the sum of the individual contributions to the electric potential from each charge. However, in contrast with electric field, electric potential is a scalar quantity. Be aware of signs!

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