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JEE Main & Advanced AIEEE Solved Paper-2008

  • question_answer
    A horizontal overhead power line is at a height of 4m from the ground and carries a current of 100 A from east to west. The magnetic field directly below it on the ground is \[({{\mu }_{0}}=4\pi \times {{10}^{-7}}T\,m\,{{A}^{-1}})\]       AIEEE  Solved  Paper-2007

    A) \[5\times {{10}^{-6}}T\] southward

    B) \[2.5\times {{10}^{-7}}T\] northward

    C) \[2.5\times {{10}^{-7}}T\] southward

    D) \[5\times {{10}^{-6}}T\] northward

    Correct Answer: A

    Solution :

                    \[B=\frac{{{\mu }_{0}}}{4\pi }\frac{2i}{r}=5\times {{10}^{-6}}T\]


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