A bar magnet has length 4 cm, cross-sectional area 2 cm² and magnetic moment 6 Am². The intensity of magnetisation of bar magnet is (a) 9 × 10⁵ A/m (b) 7.5 × 10⁵ A/m (c) 4.5 × 10⁵ A/m (d) 3.0 × 10⁵ A/m

Answer: (b). Intensity of magnetisation Mz = m/V. V = 4× 2 = 8 cm³ = 8×10⁻⁶ m³ Mz = 68×10⁻⁶ = 7.5×10⁵ A/m So the answer is (b).

A bar magnet has length 4 cm, cross-sectional area 2 cm² and magnetic… | MHT CET 2024 (11 May, Shift 1)

Q21MHT CET 2024 · 11 MAY · SHIFT 1Easy

Magnetisation: B, H, M, χ & μ

A bar magnet has length 4 cm, cross-sectional area $2\text{ cm}^2$ and magnetic moment $6\text{ Am}^2$ . The intensity of magnetisation of bar magnet is

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Answer: (b)

Intensity of magnetisation $M_z = \dfrac{m}{V}$ .
$V = 4\times 2 = 8\text{ cm}^3 = 8\times10^{-6}\text{ m}^3$
$M_z = \dfrac{6}{8\times10^{-6}} = 7.5\times10^{5}\text{ A/m}$
So the answer is (b).

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Magnetisation: B, H, M, χ & μ question from MHT CET 2024 (11 May, Shift 1)

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