J & K CET Medical J & K - CET Medical Solved Paper-2004

  • question_answer
    The specific charge of an electron is :

    A)  \[1.6\times {{10}^{-19}}C\]                        

    B)  \[4.8\times {{10}^{-19}}stat-C\]

    C)  \[1.76\times {{10}^{-11}}C/kg\]                               

    D)  \[1.76\times {{10}^{11}}C/kg\]

    Correct Answer: D

    Solution :

                     The ratio of charge (e) to mass (m) is defined as specific charge. \[\therefore \]Specific charge \[=\frac{e}{m}\] For electron \[e=1.6\times {{10}^{19}}C,\,m=9\times {{10}^{-31}}kg\] \[\therefore \]Specific charge\[=\frac{1.6\times {{10}^{-19}}}{9\times {{10}^{-31}}}\]                 \[=1.76\times {{10}^{11}}C/kg\]


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