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JEE Main & Advanced Physics Electrostatics & Capacitance Question Bank Capacitance

  • question_answer
    A charge of \[40\mu \,C\] is given to a capacitor having capacitance \[C=10\mu \,F\]. The stored energy in ergs is                                                                                              [CPMT 2002]

    A)            \[80\times {{10}^{-6}}\]  

    B)            800

    C)            80  

    D)            8000

    Correct Answer: B

    Solution :

               \[U=\frac{{{Q}^{2}}}{2C}=\frac{{{(40\times {{10}^{-6}})}^{2}}}{2\times {{10}^{-6}}\times 10}=\frac{16\times {{10}^{-10}}}{2\times {{10}^{-5}}}=8\times {{10}^{-5}}J\] \[=8\times {{10}^{-5}}\times {{10}^{7}}=800\,erg\]


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