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

  • question_answer
    A 16 pF capacitor is connected to 80 V supply. When capacitor is fully charged the amount of electric energy stored in it is:

    A) \[4.5\times {{10}^{-12}}J\]                  

    B) \[5.1\times {{10}^{-8}}J\]

    C) \[2.5\times {{10}^{-12}}J\]                  

    D) \[3.2\times {{10}^{-8}}J\]

    Correct Answer: B

    Solution :

    (b) \[5.1\times {{10}^{-8}}J\] Here, \[C=16\,pF\] \[=16\times {{10}^{-12}}f;\,\,V=80\,V\] As \[U=\frac{1}{2}C{{V}^{2}}\] \[=\frac{1}{2}\times 16\times {{10}^{-12}}\times {{\left( 80 \right)}^{2}}\] \[=5.1\times {{10}^{-8}}J\]


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