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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2005

  • question_answer
        If in a circular coil A of radius R, current\[i\]is flowing and in another coil B of radius 2R a current\[2i\]is flowing, then the ratio of the magnetic fields,\[{{B}_{A}}\]and\[{{B}_{B}}\]produced by them will be:

    A)  1                                            

    B)  2    

    C)  1/2                       

    D)  4

    Correct Answer: A

    Solution :

                    Magnetic field in circular coil A is Similarly   \[{{B}_{A}}=\frac{{{\mu }_{0}}Ni}{2R}\] R is radius and i is current flowing in coil.                 \[{{B}_{B}}=\frac{{{\mu }_{0}}N(2i)}{2.(2R)}\]                 \[=\frac{{{\mu }_{0}}Ni}{2R}\]                 \[\frac{{{B}_{A}}}{{{B}_{B}}}=\frac{1}{1}=1\]


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