Two similar sphere having charge -2C and +4C respectively are separated by distance "r" exert force (F=16N) third similar neutral sphere is first touched with sphere B and then sphere A. then force between spheres decreases by

Answer 1

touching sphere B changes its charge to 2C, and a 2C on the third. Then touching sphere A neutralizes both them (one at -2c, the other at 2C), so the charge now is zero on sphere A.

So the force now is zero between A and B.

In all of this, I assume sphere A is the -2C sphere, and B is the 4C charge initially.

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