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EAMCET Medical EAMCET Medical Solved Paper-2000

  • question_answer
    Two short bar magnets having magnetic moments in the ratio 27: 8, when placed on opposite   sides   of a deflection magnetometer. It shows no deflection. If the distance of the weaker magnet is 0.12 m from the centre of deflection magnetometer, the distance of the stronger magnet from the centre is:

    A)  0.06m                                  

    B)  0.08m

    C)  0.12m                                  

    D)  0.18m

    Correct Answer: D

    Solution :

                     For no deflection \[\frac{{{M}_{1}}}{d_{1}^{3}}=\frac{{{M}_{2}}}{d_{2}^{3}}\] \[\frac{{{M}_{1}}}{{{M}_{2}}}=\frac{d_{1}^{3}}{d_{2}^{3}}\]                 \[\frac{27}{8}={{\left( \frac{{{d}_{1}}}{{{d}_{2}}} \right)}^{3}}\Rightarrow \frac{{{d}_{1}}}{{{d}_{2}}}=\frac{3}{2}\] \[\frac{{{d}_{1}}}{0.12}=\frac{3}{2}\] \[{{d}_{1}}=0.18\,m\]


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