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

  • question_answer
    The mid points of two small magnetic dipoles of length d in end-on positions, are separated by a distance x, (x>>d). The force between them is proportional to \[{{x}^{-n}}\] where n is:

    A) 1

    B) 2     

    C) 3

    D) 4

    Correct Answer: D

    Solution :

    [d]   In magnetic dipole \[Force\propto \frac{1}{{{r}^{4}}}\] In the given question. \[Force\propto {{x}^{-n}}\] Hence, n = 4


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