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12th Class Physics Electrostatics & Capacitance Question Bank MCQ - Electrostatic Potential and Capacitance

  • question_answer
    The electric potential at the surface of an atomic nucleus (Z = 50) of radius \[9.0\times {{10}^{-13}}cm\]is:

    A) \[9\times {{10}^{5}}V\]                       

    B) \[8\times {{10}^{6}}V\]

    C) \[80\,\,V\]                     

    D) \[9\,V\]

    Correct Answer: B

    Solution :

    (b) \[8\times {{10}^{6}}V\] We know that, \[V=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{q}{r}=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{Ze}{r}\] \[=\frac{9\times {{10}^{9}}\times 50\times 1.6\times {{10}^{-19}}}{9\times {{10}^{-13}}\times {{10}^{-2}}}=8\times {{10}^{6}}V\]


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