JEE Main & Advanced Physics Magnetism Question Bank Magnetic Equipments

  • question_answer
    When two magnetic moments are compared using equal distance method the deflections produced are 45o and 30o. If the length of magnets are in the ratio 1 : 2, the ratio of their pole strengths is                                 [JIPMER 2002]

    A)            3 : 1                                          

    B)            3 : 2

    C)            \[\sqrt{3}:1\]                       

    D)            \[2\sqrt{3}:1\]

    Correct Answer: D

    Solution :

               \[\frac{{{M}_{1}}}{{{M}_{2}}}=\frac{\tan {{\theta }_{1}}}{\tan {{\theta }_{2}}}\Rightarrow \frac{{{m}_{1}}{{L}_{1}}}{{{m}_{2}}{{L}_{2}}}=\frac{\tan {{\theta }_{1}}}{\tan {{\theta }_{2}}}\] \[\Rightarrow \frac{{{m}_{1}}}{{{m}_{2}}}=\frac{2}{1}\times \frac{\tan 45{}^\circ }{\tan 30{}^\circ }=\frac{2\sqrt{3}}{1}\]


You need to login to perform this action.
You will be redirected in 3 sec spinner