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

  • question_answer
    When the current flowing in a circular coil is doubled and the number of turns of the coil in it is halved, the magnetic field at its centre will become                                  [DPMT 2003]

    A)            Four times                            

    B)            Same

    C)            Half                                          

    D)            Double

    Correct Answer: B

    Solution :

               \[B=\frac{{{\mu }_{0}}}{4\pi }.\frac{2\pi ni}{r}\Rightarrow B\propto ni\]


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