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12th Class Physics Electric Charges and Fields Question Bank MCQ - Electric Charges and Fields

  • question_answer
    Electric field required to keep a water drop of mass 'm' just to remain suspended when charged with 1 electron is:

    A) \[mg\]                           

    B) \[\frac{mg}{e}\]

    C) emg                             

    D) \[\frac{em}{g}\]

    Correct Answer: B

    Solution :

    (b) \[\frac{mg}{e}\] Mass of water drop = m Weight of water drop = mg \[\because \]mg = electrostatic force applied by the field \[\therefore \,\,\,mg=qE=eE\] \[\Rightarrow \,\,E=\frac{mg}{e}\]


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