A bar of iron having magnetic moment 2.4 Am² weighs 66 g. If the density of the material of the bar is 7700 kg/m³, the intensity of magnetisation in Am⁻¹ is (a) 1.4 × 10⁵ (b) 2.8 × 10⁵ (c) 1.4 × 10⁴ (d) 2.8 × 10⁴

Answer: (b). Volume V = (0.066)/(7700) = 8.57 × 10⁻⁶ m³ Intensity of magnetisation = m/V = 2.48.57 × 10⁻⁶ = 2.8 × 10⁵ A m⁻¹ So the answer is (b).

A bar of iron having magnetic moment 2.4 Am² weighs 66 g. If the… | MHT CET 2025 (26 Apr, Shift 1)

Q19MHT CET 2025 · 26 APR · SHIFT 1Medium

Magnetisation: B, H, M, χ & μ

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

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Answer: (b)

Volume $V = \dfrac{0.066}{7700} = 8.57 \times 10^{-6}\ \text{m}^3$
Intensity of magnetisation $= \dfrac{m}{V} = \dfrac{2.4}{8.57 \times 10^{-6}} = 2.8 \times 10^{5}\ \text{A m}^{-1}$
So the answer is (b).

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Magnetisation: B, H, M, χ & μ question from MHT CET 2025 (26 Apr, Shift 1)

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