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Two spherical conductor B and C having equal radii and carrying equal charges in them repel each other with a force F when kept apart at some distance. A third spherical conductor having same radius as that of B but uncharged brought in contact with B , then brought in contact with C and finally removed away from both. The new force of repulsion, between B and C is

Options

  1. AF / 4
  2. B3 F / 4
  3. CF / 8
  4. D3 ~F / 8 .

Correct answer

D. 3 ~F / 8 .

Step-by-step solution

F^ = 1 4 ₀ (q / 2)(3 q / 4) d^2 = 3 F 8

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