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

  • question_answer
    The potential at a point due to a charge of \[5\times {{10}^{-7}}C\] located 10 cm away is:

    A) \[3.5\times {{10}^{5}}V\]                    

    B) \[3.5\times {{10}^{4}}V\]

    C) \[4.5\times {{10}^{4}}V\]                    

    D) \[4.5\times {{10}^{5}}V\]

    Correct Answer: C

    Solution :

    (c) \[4.5\times {{10}^{4}}V\] Here, \[q=5\times {{10}^{-7}}C,\,r=10\,cm=0.1\,m\] Potential \[V=\frac{1}{4\pi {{\varepsilon }_{0}}}\frac{q}{r}=\frac{9\times {{10}^{9}}\times 5\times {{10}^{-7}}}{0.1}=4.5\times {{10}^{4}}V\]


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