JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Capacitance

  • question_answer
    Two insulated charged spheres of radii \[20\,cm\] and \[25\,cm\]respectively and having an equal charge \[Q\] are connected by a copper wire, then they are separated                                                                                              [NCERT 1971]

    A)                    Both the spheres will have the same charge \[Q\]

    B)                    Charge on the \[20\ cm\] sphere will be greater than that on the \[25\ cm\] sphere

    C)                    Charge on the \[25\ cm\] sphere will be greater than that on the \[20\ cm\] sphere

    D)                    Charge on each of the sphere will be \[2Q\]

    Correct Answer: C

    Solution :

                       After the connection of wire \[{{V}_{1}}={{V}_{2}}\] \ \[\frac{{{Q}_{1}}}{25}=\frac{{{Q}_{2}}}{20}\] Þ \[\frac{{{Q}_{1}}}{{{Q}_{2}}}=\frac{25}{20}\] Þ \[{{Q}_{1}}>{{Q}_{2}}\]


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