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

  • question_answer
    A capacitor of capacitance 700 pF is charged by 100 V battery. The electrostatic energy stored by the capacitor is:

    A) \[2.5\times {{10}^{-8}}J\]                    

    B) \[3.5\times {{10}^{-6}}J\]

    C) \[2.5\times {{10}^{-4}}J\]                    

    D) \[3.5\times {{10}^{-4}}J\]

    Correct Answer: B

    Solution :

    (b) \[3.5\times {{10}^{-6}}J\] Here, \[C=700\,pF=700\times {{10}^{-12}}F,\,V=100V\] Energy stored,\[U=\frac{1}{2}C{{V}^{2}}\] \[=\frac{1}{2}\times 700\times {{10}^{-12}}\times {{\left( 100 \right)}^{2}}\] \[=3.5\times {{10}^{-6}}J\]


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