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

  • question_answer
    The magnetic field at the centre of a circular coil of radius r carrying current I is \[{{B}_{1}}\]. The field at the centre of another coil of radius 2 r carrying same current I is \[{{B}_{2}}\]. The ratio \[\frac{{{B}_{1}}}{{{B}_{2}}}\] is                                                                            [MP PET 2001]

    A)            \[\frac{1}{2}\]                      

    B)            1

    C)            2    

    D)            4

    Correct Answer: C

    Solution :

               \[B\propto \frac{1}{r}\Rightarrow \frac{{{B}_{1}}}{{{B}_{2}}}=\frac{{{r}_{2}}}{{{r}_{1}}}=\frac{2r}{r}=2\]


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