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NEET Sample Paper NEET Sample Test Paper-79

  • question_answer
    The magnetic field at a distance d from a long wire carrying current i is 0.4 T. The magnetic field at a distance 2d is

    A)  1.6 T               

    B)  6.8 T                

    C)  0.2 T               

    D)  0.1 T

    Correct Answer: C

    Solution :

    Magnetic field \[B=\frac{{{\mu }_{0}}i}{2\pi d}\]            (due to a long wire) \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,B\propto \frac{1}{d}\] So, if d is doubled, the magnetic field becomes halved \[\therefore \,\,\,\, Magnetic field =0.2 T\]


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