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

  • question_answer
    A capacitor of capacitance C has charge Q and stored energy is W. If the charge is increased to 2Q, the stored energy will be:

    A) W/4                             

    B) W/2     

    C) 2W                  

    D) 4W

    Correct Answer: D

    Solution :

    (d) 4W Energy stored in a capacitor, \[W=\frac{{{Q}^{2}}}{2C}\] Now, if charge Q increases to 2Q, then energy stored \[W'=\frac{{{\left( 2Q \right)}^{2}}}{2C}=\frac{4{{Q}^{2}}}{2C}=4W\]


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