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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
    What should be the current in a circular coil of radius 5cm to annul \[{{B}_{H}}=5\times {{10}^{-5}}T\]                                         [DCE 2001]

    A)            0.4 A                                        

    B)            4 A

    C)            40 A                                         

    D)            1 A

    Correct Answer: B

    Solution :

                       \[B={{10}^{-7}}\frac{2\pi i}{r}\]; according to question BH = B            \[\Rightarrow 5\times {{10}^{-5}}={{10}^{-7}}\times \frac{2\times 3.14\times i}{5\times {{10}^{-2}}}\Rightarrow i=4A\]


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