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JIPMER Jipmer Medical Solved Paper-1998

  • question_answer
    The electric field required to keep a water drop of mass in just to remain suspended, when charged with one electron:

    A)  \[\text{em/g}\]

    B)                                         \[\text{mg/e}\]                              

    C)  \[\text{emg}\]                

    D)         \[\text{mg}\]

    Correct Answer: B

    Solution :

    Here: mass of water drop \[=m,\] so, weight of water drop\[=mg\] so, \[mg=\] electrostatic force applied by the field \[mg=qE=eE\,\,\,\Rightarrow \,\,\,E=\frac{mg}{e}\]


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