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CMC Medical CMC-Medical VELLORE Solved Paper-2010

  • question_answer
    A charged oil drop of mass \[9.75\times {{10}^{-15}}\]kg and charge \[30\times {{10}^{-16}}\]C is suspended in a uniform electric field existing between two parallel plates. The field between the plates, taking\[(g=10\,m{{s}^{-2}})\]is

    A)  3.25 V/m            

    B)  300 V/m

    C)  325 V/m             

    D)  32.5 V/m

    E)  None of these

    Correct Answer: D

    Solution :

                    In equilibrium, \[eE=mg\] \[\Rightarrow \]                               \[E=\frac{mg}{e}\]                                 \[=\frac{9.75\times {{10}^{-15}}\times 10}{30\times {{10}^{-16}}}\]                                 \[=32.5\,V\text{/}m\]


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