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Intensity of magnetisation of a bar from its magnetic moment, mass and density

The same question, asked 2 times: 26 Apr 2025 S1*, 16 Apr 2026 S1. Every wording below, oldest first.

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  1. Question 1

    26 Apr 2025 S1

    38
    A bar of iron having magnetic moment 2.4Am22.4Am^{2} weighs 66 g. If the density of the material of the bar is 7700 kg/m37700\text{ }kg/m^{3}, the intensity of magnetisation in Am−1Am^{- 1} is

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  2. Question 2

    16 Apr 2026 S1

    131
    The magnetic moment produced in a sample of 2 gram is 8×10−7 A/m28 \times 10^{-7}\ \mathrm{A/m^2}. If its density is 4 g/cm3\mathrm{g/cm^3} then the magnetization of the sample is

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