BCECE Engineering BCECE Engineering Solved Paper-2014

  • question_answer
     A horizontal overhead power line carries a current of 90A in east to west direction. Magnitude of magnetic field due to the  current 1.5 m below the line is

    A) \[1.2T\]                                 

    B) \[1.2\times {{10}^{-10}}T\]

    C) \[0T\]                                   

    D) \[1.2\times {{10}^{-5}}T\]           

    Correct Answer: D

    Solution :

    Magnitude of magnetic field due to current   \[B=\frac{{{\mu }_{0}}}{2\pi }\frac{i}{r}\] \[B={{10}^{-7}}\times \frac{2\times 90}{1.5}=1.2\times {{10}^{-5}}T\]


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