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JEE Main & Advanced Physics Magnetism Question Bank Earth's Magnetism

  • question_answer
    In two separate experiments the neutral points due to two small magnets are at a distance of r and 2r in broad side-on position. The ratio of their magnetic moments will be                                               [MP PMT 1985]

    A)            4 : 1                                          

    B)            1 : 2

    C)            2 : 1                                          

    D)            1 : 8

    Correct Answer: D

    Solution :

               At broad side-on position \[B=\frac{M}{{{d}^{3}}}\]                    \[\therefore \,\frac{{{M}_{1}}}{d_{1}^{3}}=\frac{{{M}_{2}}}{d_{2}^{3}}or\frac{{{M}_{1}}}{{{r}^{3}}}=\frac{{{M}_{2}}}{8{{r}^{3}}}or\frac{{{M}_{1}}}{{{M}_{2}}}=\frac{{{r}^{3}}}{8{{r}^{3}}}=\frac{1}{8}\]


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