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7 October, 17:00

three identical metal spheres are labelled a, b and c. initially, a has charge + 5q/2, b has charge + 3q/2 and c has charge - 4q. b is first touched to a, removed, then touched to c and removed. finally, all three spheres are brought into contact with one another simultaneously (a touching b while b is also touching c) before once again being separated. what is the final electric charge on sphere b?

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  1. 7 October, 20:43
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    When all the three are touched together, total charge will be equally distributed among them. Total charge = 5q/2 + 3q/2 - 4q = 0

    Since total charge is zero, charge on each will be zero. Hence b too will have charge equal to zero.
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