JEE Main & Advanced Physics Magnetic Effects of Current / करंट का चुंबकीय प्रभाव Question Bank Biot-savart's Law and Amperes Law

  • question_answer
    In hydrogen atom, an electron is revolving in the orbit of radius \[0.53\,{AA}\] with \[6.6\times {{10}^{15}}\]rotations/second. Magnetic field produced at the centre of the orbit is        [MP PET 2003]

    A) \[0.125\,wb/{{m}^{2}}\] 

    B) \[1.25\,wb/{{m}^{2}}\]

    C) \[12.5\,wb/{{m}^{2}}\]    

    D) \[125\,wb/{{m}^{2}}\]

    Correct Answer: C

    Solution :

    \[B=\frac{{{\mu }_{0}}}{4\pi }\cdot \frac{2\pi (q\nu )}{r}\] \[={{10}^{-7}}\times \frac{2\times 3.14\times (1.6\times {{10}^{-19}}\times 6.6\times {{10}^{15}})}{0.53\times {{10}^{-10}}}\]\[=12.5\,Wb/{{m}^{2}}\]


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