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CMC Medical CMC-Medical Ludhiana Solved Paper-2011

  • question_answer
    An electric current is flowing in a long straight wire. The magnetic field due to this current at a distance of 5 cm from the wire is 10 G. The magnetic field at a distance of 10 cm from the wire is

    A)  2.5 G                                    

    B)  5 G

    C)  20 G                                     

    D)  40 G

    Correct Answer: B

    Solution :

    \[B=\frac{{{\mu }_{0}}I}{2\pi r}\] \[\Rightarrow \]               \[B\propto \frac{1}{r}\,\,\,\Rightarrow \,\,\,\frac{{{B}_{1}}}{{{B}_{2}}}=\frac{{{r}_{2}}}{{{r}_{1}}}\] \[\Rightarrow \]               \[\frac{10}{{{B}_{2}}}=\frac{10}{5}\] \[\Rightarrow \]               \[{{B}_{2}}=5\,G\]


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