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JIPMER Jipmer Medical Solved Paper-2003

  • question_answer
    The ratio of magnetic moments of two short magnets which give null deflection in tan B position at 12 cm and 18 cm from the centre of a deflection magnetometer is:

    A)  4 : 9      

    B)                         27 : 8                    

    C)  2 : 3                      

    D)         8 : 27

    Correct Answer: D

    Solution :

    \[\frac{{{M}_{1}}}{d_{1}^{3}}=\frac{{{M}_{2}}}{d_{2}^{3}}\] or \[\frac{{{M}_{1}}}{{{M}_{2}}}={{\left( \frac{{{d}_{1}}}{{{d}_{2}}} \right)}^{3}}={{\left( \frac{2}{3} \right)}^{3}}=\frac{8}{27}\] \[{{M}_{1}}:{{M}_{2}}=8:27\]


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