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JIPMER Jipmer Medical Solved Paper-2003

  • question_answer
    Magnetic field of a short magnet at a distance 1 m on axial line is 1 oersted at a distance 2 m on the same line the intensity in oersted is:

    A)  0.75                      

    B)                                         0.125                   

    C)  0.25                      

    D)         0.5

    Correct Answer: B

    Solution :

    \[B\propto \frac{1}{{{r}^{3}}}\] Hence,  \[\frac{{{B}_{2}}}{{{B}_{1}}}={{\left( \frac{{{r}_{1}}}{{{r}_{2}}} \right)}^{3}}\] \[{{B}_{2}}={{\left( \frac{{{r}_{1}}}{{{r}_{2}}} \right)}^{3}}\times {{B}_{1}}={{\left( \frac{1}{2} \right)}^{3}}\times 1\]                 \[=0.125\,\text{oersted}\]


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