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Consider three identical metal spheres ...

Consider three identical metal spheres ` A, B` and `C`. Sphere `A` carries charge ` + 6q`, sphere `B` carries charge `-3q` and sphere `C` carries no charge . Spheres A and B are touched together and then separated. Sphere `C` is then touched to sphere `A` and separated from it . Finally the sphere `C` is touched to sphere `B` and separated from it . Find the final charge on the sphere `C`.

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The correct Answer is:
`1.125 q`
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