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NEET Sample Paper NEET Sample Test Paper-46

  • question_answer
    64 small drops of mercury, each of radius r and charge q, coalesce to form a big drop. The ratio of the surface density of charge of each small drop with that of the big drop is -

    A) 64 : 1

    B)                    1 : 64

    C)                    1 : 4

    D)                    4 : 1

    Correct Answer: C

    Solution :

    \[\sigma \,\,=\,\,\frac{Q}{4\pi {{R}^{2}}}\,\propto \,\frac{R}{{{R}^{2}}}\,\,\propto \,\,\frac{1}{R}\]


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