Question
Two spherical conductors 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, is 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
Solution
D.
Let the spherical conductors Band C have same charge as q. The electric force between them is
r - being the distance between them.
When third uncharged conductor A is brought in contact with B, then charge on each conductor.
When this conductor A is now brought in contact with C, then charge on each conductor
Hence, electric force acting between B and C is
