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

  • question_answer
    In the question number 15, work done in bringing a charge \[5\times {{10}^{-7}}C\]of \[4\times {{10}^{-9}}C\]from infinity to that point is:

    A) \[2.4\times {{10}^{-4}}J\]                    

    B) \[1.8\times {{10}^{-4}}J\]

    C) \[3.2\times {{10}^{-5}}J\]                    

    D) \[4.1\times {{10}^{-5}}J\]

    Correct Answer: B

    Solution :

    (b) \[1.8\times {{10}^{-4}}J\] Work done, \[W=q\left( {{V}_{f}}-{{V}_{i}} \right)\] \[=4\times {{10}^{-9}}\times 4.5\times {{10}^{4}}=1.8\times {{10}^{-4}}J\]


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