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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 earth?s magnetic field at a given point is \[0.5\times {{10}^{-5}}Wb\text{-}{{m}^{-2}}\]. This field is to be annulled by magnetic induction at the center of a circular conducting loop of radius 5.0cm. The current required to be flown in the loop is nearly [AIIMS 2003]

    A)            0.2 A                                        

    B)            0.4A

    C)            4A 

    D)            40A

    Correct Answer: B

    Solution :

                       Magnetic field at the centre of circular loop            \[B=\frac{{{\mu }_{0}}}{4\pi }\frac{2\pi i}{r}\Rightarrow 0.5\times {{10}^{-5}}=\frac{{{10}^{-7}}\times 2\times 3.14\times i}{5\times {{10}^{-2}}}\] i = 0.4 A


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