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Suppose the spheres A and B have identical sizes. A third sphere of the same size but uncharged is brought in contact with the first, then brought in contact with the second, and finally removed from both. What is the new force of repulsion between A and B?

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$(A)\; 5.7 \times 10^{-3}\;N$
Hence A is the correct answer.
answered Jun 4, 2014 by