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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Capacitance

  • question_answer
    Twenty seven drops of water of the same size are equally and similarly charged. They are then united to form a bigger drop. By what factor will the electrical potential changes [MP PET 1991; MP PMT 1994; RPET 2001]

    A)                    9 times

    B)                                      27 times

    C)                    6 times                            

    D)            3 times

    Correct Answer: A

    Solution :

               \[{{V}_{Big}}={{n}^{2/3}}.{{v}_{small}}\] Þ \[{{V}_{Big}}={{(27)}^{2/3}}.{{v}_{small}}=9\,{{v}_{small}}\]


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