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Suppose the spheres A & B in Q. 41 have ...

Suppose the spheres A & B in Q. 41 have identical sizes. A third sphere of same size but uncharged is brought in contact with the first then brought in contact with the first then brought in contact with the second and finally removed from both. What is the new force of repulsion between A & B

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When a third sphere C is brought in contact with A, then charge gets shared equally.
`q._(A)= (6.25 xx 10^(-7) + 10)/2 = 3.25 xx 10^(-7)C`
Now, if the sphere C having charge `3.25 xx 10^(-7)C` is brought in contact with sphere B, then charge on sphere B is:
`q._(B)=(3.25 xx 10^(-7)+6.5 xx 10^(-7))/2=4.875 xx 10^(-7)C`
`:." "F.=(9 xx 10^(9) xx 3.25 xx 10^(-7) xx 4.875 xx 10^(-7))/((50 xx 10^(-2))^(2))=5.7 xx 10^(-3)N`.
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