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MGIMS WARDHA MGIMS WARDHA Solved Paper-2003

  • question_answer
    Number of extra electrons in a body of charge \[-\text{ }80\,\mu C,\] is :                

    A) \[80\times {{10}^{15}}\]                               

    B) \[80\times {{10}^{-}}^{15}\]     

    C) \[5\times {{10}^{14}}\]                                 

    D) \[1.28\times {{10}^{-}}^{17}\] 

    Correct Answer: C

    Solution :

    Charge on an electron\[=1.6\times {{10}^{-19}}C\]Number of extra electrons in an object having charge -\[-80\mu C\] \[=\frac{80\times {{10}^{-6}}}{1.6\times {{10}^{-19}}}\] \[=5\times {{10}^{14}}\]


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