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JEE Main & Advanced JEE Main Paper (Held On 9 April 2014)

  • 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:   [JEE Main Online Paper ( Held On 09 Apirl  2014  )

    A) 1                                             

    B) 2

    C) 3                                             

    D) 4

    Correct Answer: D

    Solution :

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


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