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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2008

  • question_answer
    In the Bohr model of hydrogen atom, the electron is pictured to rotate in a circular orbit of radius \[5\times {{10}^{-11}}m\], at a speed \[2.2\times {{10}^{6}}m/s\]. What is the current associated with electron motion?

    A)  1.12 mA                              

    B)  3 mA

    C)  0.75 mA                              

    D)  2.25 mA

    Correct Answer: A

    Solution :

    Frequency of revolution of electron,     \[f=\frac{v}{2\pi r}=\frac{2.2\times {{10}^{6}}}{2\pi (5\times {{10}^{-11}})}=7.0\times {{10}^{15}}Hz\] Current associated, \[i=q\,f\]                 \[=(1.6\times {{10}^{-19}})(7.0\times {{10}^{15}})\]                 \[=11.2\times {{10}^{-4}}A=1.12\,mA\]


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