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JEE Main & Advanced Physics Magnetism Question Bank Self Evaluation Test - Magnetism and Matter

  • question_answer
    Two short magnets with their axes horizontal and perpendicular to the magnetic maridian are placed with their centres 40 cm east and 50 cm west of magnetic needle. If the needle remains undeflected, the ratio of their magnetic moments \[{{M}_{1}}:{{M}_{2}}\]is                

    A) 4 : 5

    B) 16 : 25

    C) 64 : 125

    D) \[2:\sqrt{5}\]

    Correct Answer: C

    Solution :

    [c] For null deflection \[\frac{{{M}_{1}}}{{{M}_{2}}}={{\left( \frac{{{d}_{1}}}{{{d}_{2}}} \right)}^{3}}={{\left( \frac{40}{50} \right)}^{3}}=\frac{64}{125}\]


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