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

  • question_answer
    A capacitor is charged through a potential difference of 200 V, when 0.1 C charge is stored in it. The amount of energy released by it, when it is discharged is:

    A) 5J    

    B) 10J     

    C) 20J                  

    D) 2.5J

    Correct Answer: B

    Solution :

    (b) 10J Here, \[V=200\text{ }V,q=0.1\text{ }C\] Energy stored,  \[U=\frac{1}{2}qV\] \[=\frac{1}{2}\times 0.1\times 200=10\,\,J\] When the capacitor is discharged, it releases the same amount of energy i.e., 10 J.


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