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CET Karnataka Medical CET - Karnataka Medical 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, \[i=qf\] \[=(1.6\times {{10}^{-19}})(7.0\times {{10}^{15}})\] \[=11.2\times {{10}^{-4}}A=1.12mA\]


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