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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 :

Options

  1. A1 ~N
  2. B6 ~N
  3. C12 ~N
  4. D4 ~N

Correct answer

B. 6 ~N

Step-by-step solution

aligned & F_ P S Q^2 & F_ P S =16 ~N aligned Now If P ~ &~ R are brought in contact then Now If S & R are brought in contact then New force between P ~ &~ S is : aligned & F _ PS Q 2 3 Q 4 & ~F _ PS 3 Q ^2 8 = 3 8 16=6 ~N aligned

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