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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Electric Field and Potential

  • question_answer
    Point charges \[+4q,\,-q\] and \[+4q\] are kept on the \[x-\]axis at points \[x=0,\,x=a\] and \[x=2a\] respectively, then [CBSE PMT 1992]

    A)                    Only \[q\] is in stable equilibrium

    B)                    None of the charges are in equilibrium

    C)                    All the charges are in unstable equilibrium

    D)                    All the charges are in stable equilibrium

    Correct Answer: C

    Solution :

                 Force on each charge is zero. But if any of the charge is displaced, the net force starts acting on all of them.


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