JEE Main & Advanced Physics Magnetism Question Bank Magnet and its Properties

  • question_answer
    Two small bar magnets are placed in a line with like poles facing each other at a certain distance d apart. If the length of each magnet is negligible as compared to d, the force between them will be inversely proportional to [CPMT 1971; NCERT 1971; MP PMT 1992]

    A)            \[d\]                                        

    B)            \[{{d}^{2}}\]

    C)            \[\frac{1}{{{d}^{2}}}\]      

    D)            \[{{d}^{4}}\]

    Correct Answer: D

    Solution :

               \[F=\frac{{{\mu }_{0}}}{4\pi }\left( \frac{6M{M}'}{{{d}^{4}}} \right)\]in end-on position.


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