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BCECE Engineering BCECE Engineering Solved Paper-2013

  • question_answer
    Which of the following graphs shows the variation of magnetic field B, with distance from a long current carrying conductor?

    A)                                    

    B)       

    C)                                                            

    D)       

    Correct Answer: C

    Solution :

    For a long conductor, magnetic field at distance r is \[B=\frac{{{\mu }_{0}}}{4\pi }\times \frac{2l}{r}=\frac{{{\mu }_{0}}l}{2\pi r}\]                 \[\therefore \]                  \[B\propto \frac{1}{r}\] So, graph between B and r should be a parabola as given in option (c).


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