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# Two insulated charged copper spheres A and B have their centers separated by a distance of 50 cm. What is the mutual force of electrostatic repulsion if the charge on each is $6.5 \times 10^{−7}\; C?$ The radii of A and B are negligible compared to the distance of separation.

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$1.5 \times 10^{-2} N$
Hence A is the correct answer.
answered Jun 4, 2014 by