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NEET Sample Paper NEET Sample Test Paper-13

  • question_answer
    An electric current passes through a long straight wire. At a distance 5 cm from the wire the magnetic field is B. The field at 20 cm from the wire would be

    A)  \[\frac{B}{6}\]

    B)  \[\frac{B}{4}\]

    C)  \[\frac{B}{3}\]

    D)  \[\frac{B}{2}\]

    Correct Answer: B

    Solution :

    \[B={{10}^{-7}}\frac{2i}{r}\Rightarrow \frac{B}{B'}=\frac{20}{5}\Rightarrow B'=B/4\]


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