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

  • question_answer
    Points A and B are situated perpendicular to the axis of a 2cm long bar magnet at large distances X and 3X from its centre on opposite sides. The ratio of the magnetic fields at A and B will be approximately equal to         [CPMT 1988]

    A)            1 : 9                                          

    B)            2 : 9

    C)            27 : 1                                        

    D)            9 : 1

    Correct Answer: C

    Solution :

               \[B\propto \frac{1}{{{x}^{3}}}\Rightarrow \frac{{{B}_{1}}}{{{B}_{2}}}={{\left( \frac{{{x}_{2}}}{{{x}_{1}}} \right)}^{3}}={{\left( \frac{3x}{x} \right)}^{3}}=\frac{27}{1}\]


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