NEET Sample Paper NEET Sample Test Paper-19

  • question_answer 45) A current of \[(1/4\pi )\]ampere is flowing in a long straight conductor. The line integral of magnetic field around a closed path enclosing the current carrying conductor is:

    A) \[{{10}^{-7}}\] weber per meter

    B) \[4\pi \times {{10}^{-7}}\] weber per meter

    C) \[16{{\pi }^{2}}\times {{10}^{-7}}\]weber per meter

    D)  0

    Correct Answer: A

    Solution :

    By Amperes Law, we get, \[\vec{B}.\overrightarrow{dl}={{\mu }_{0}}I=4\pi \times {{10}^{-7}}\times \frac{1}{4\pi }={{10}^{-7}}\,w/{{m}^{2}}\] Hence, the correction option is [a].

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