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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
    A charge q coulomb makes\[n\]revalution in 1 s in a circular orbit of radius r. The magnetic field at the centre of the orbit in N/Am is

    A)  \[\left( \frac{2\pi m}{q}\times {{10}^{-7}} \right)\]         

    B)  \[\left( \frac{2\pi q}{q} \right)\times {{10}^{-7}}\]

    C)  \[\left( \frac{2\pi q}{nr} \right)\times {{10}^{-7}}\]         

    D)  \[\left( \frac{2\pi nq}{r} \right)\times {{10}^{-7}}\]

    Correct Answer: D

    Solution :

                    We know that, \[=\frac{{{\mu }_{0}}}{4\pi }.\frac{nq(2\pi )}{r}\] \[=\left( \frac{2\pi nq}{r} \right)\times {{10}^{-7}}\]       


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