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Two identical conducting spheres (#1 and #2) carry charges Q and 3Q respectively. They are separated...

Two identical conducting spheres (#1 and #2) carry charges Q and 3Q respectively. They are separated by a distance r much larger than their diameters. Another identical conducting sphere (#3) is uncharged. Sphere #3 is first touched to #1, then to #2, and finally removed. As a result, the Coulomb force between #1 and #2, which was originally F, becomes:

1-7F/8

2-6F/15

3-3F/14

4-9F

5-7F/24

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