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confused on this

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Q 18.2: Two identical particles are separated by a distance of 0.0010 m. You measure a repulsive coulomb
force of 3.0 x 10-14 N. What is the charge of the particles?
It could be either + 1.8 x 10- C or - 1.8 x 10-15 C.
It could be either + 1.8 x 10-15 C or - 3.0 x 10-20 C.
c) +1.8 x 10-15 C.
D) +3.0 x 10-20 C.

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