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JCECE Engineering JCECE Engineering Solved Paper-2002

  • question_answer
    If a current flows through an infinitely long straight wire, the magnetic field produced at a point \[1\,\,m\] away from it, is:

    A) \[2\times {{10}^{-3}}T\]               

    B) \[2\times {{10}^{-1}}T\]

    C)  \[2\times {{10}^{-7}}T\]                              

    D)  \[2\pi \times {{10}^{-6}}T\]

    Correct Answer: C

    Solution :

    The magnetic Held produced at a point \[1\,\,m\] away from the wire is                 \[B=\frac{{{\mu }_{0}}}{4\pi }\frac{2i}{r}\] \[\therefore \]  \[B=\frac{{{10}^{-7}}\times 2\times 1}{1}=2\times {{10}^{-7}}T\]


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