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

  • question_answer
    Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magnetrons (1 Bohr magnetos \[=9.27\times {{10}^{-24}}\,A-{{m}^{2}}\]). The density of atoms in iron is \[8.52\times {{10}^{28}}\,atoms/{{m}^{3}}.\]Find the maximum magnetic moment per unit volume.

    A) \[1.5\times {{10}^{2}}\,A/m\]

    B) \[1.58\times {{10}^{6}}\,A/m\]

    C) \[1.2\times {{10}^{5}}\,A/m\]

    D) \[1.3\times {{10}^{6}}\,A/m\]

    Correct Answer: B

    Solution :

    [b] The total magnetic moment per unit volume. \[=\frac{(8.52\times {{10}^{28}})\times (2\times 9.27\times {{10}^{-24}})}{1}\] \[=1.58\times {{10}^{6}}\,A/m\]


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