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There are two identical sphere A and B having charge +4q and -q at a particular separation attract each other by force F . A third identical uncharge sphere firstly touch with A and then to B. What is the force between A and B. What is the force if third sphere firstly touch with B and then withh A.

    • Posted by Jyoti Singh 7 years, 8 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Jin Kazama 7 years, 8 months ago

    A=+4q , B=-q when we touch third uncharged sphere (say C ) then charge become equal on both , A=C=+4q/2=+2q then C with B , B=C=q/2 , F1(before C)=-4kq²/r² F2(after C) = kq²/r² , F1=-4F2 If sphere C was 1st touch with B and then A charge changes and F2=-7kq²/8r²

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