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

  • question_answer
    The potential at a point, due to a positive charge of \[100\mu C\]at a distance of 9 m, is:

    A) \[{{10}^{4}}V\]                      

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

    C) \[{{10}^{5}}V\]                      

    D) \[{{10}^{7}}V\]

    Correct Answer: C

    Solution :

    (c) \[{{10}^{5}}V\] Here, \[q=100\mu C=100\times {{10}^{-6}},\,r=9m\] \[V=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{q}{r}\] \[=\frac{9\times {{10}^{9}}\times 100\times {{10}^{-6}}}{9}={{10}^{5}}V\]


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