Two identical conducting spheres \(P\) and \(S\) with charge \(Q\) on each, repel each other with a force \(16 \ N\). A …

Two identical conducting spheres \(P\) and \(S\) with charge \(Q\) on each, repel each other with a force \(16 \ N\). A third identical uncharged conducting sphere \(R\) is successively brought in contact with the two spheres. The new force of repulsion between \(P\) and \(S\) is :

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