Two identical charged conducting spheres 
and 
have their centres separated by a certain
distance. Charge on each sphere is q and the force of repulsion between them is F. A third identical uncharged conducting sphere is brought in contact with sphere A first and then with B and finally removed from both. New force of repulsion between spheres 
and 
(Radii of 
and 
are negligible compared to the distance of separation so that for calculating force between them they can be considered as point charges) is best given as:
Text Solution
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on touching; 
After touching 
& 
Total charge 
&
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