CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2002

  • question_answer
    Two copper balls, each weighing 10 g are kept in air 10 cm apart. If one electron from every \[{{10}^{6}}\] atoms is transferred from one ball to the other, the coulomb force between them is:  (atomic weight of copper is 63.5)

    A) \[2.0\times {{10}^{4}}N\]                            

    B) \[2.0\times {{10}^{10}}N\]

    C)  \[2.0\,{{10}^{6}}N\]                      

    D) \[2.0\times {{10}^{8}}N\]

    Correct Answer: D

    Solution :

    Energy stored in a capacitor \[=\frac{1}{2}qV.\] Where \[qV=\]total energy of battery \[\therefore \]  \[{{E}_{c}}=\frac{{{E}_{b}}}{2}=50%\]


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