A bar magnet has length 3 cm, cross-sectional area 2 cm² and magnetic moment 3 Am². The intensity of magnetisation of bar magnet is (a) 2 × 10⁵ A/m (b) 3 × 10⁵ A/m (c) 4 × 10⁵ A/m (d) 5 × 10⁵ A/m

Answer: (d). Mz = m/V, V = 3×2 = 6 cm³ = 6×10⁻⁶ m³. Mz = 36×10⁻⁶ = 5×10⁵ A/m So the answer is (d).

A bar magnet has length 3 cm, cross-sectional area 2 cm² and magnetic… | MHT CET 2021 (23 Sep, Shift 1)

Q34MHT CET 2021 · 23 SEP · SHIFT 1Easy

Magnetisation: B, H, M, χ & μ

A bar magnet has length $3\text{ cm}$ , cross-sectional area $2\text{ cm}^2$ and magnetic moment $3\text{ Am}^2$ . The intensity of magnetisation of bar magnet is

Show answer and solution

Answer: (d)

$M_z = \dfrac{m}{V}$ , $V = 3\times2 = 6\text{ cm}^3 = 6\times10^{-6}\text{ m}^3$ .
$M_z = \dfrac{3}{6\times10^{-6}} = 5\times10^{5}\text{ A/m}$
So the answer is (d).

Report a mistake

More questions on Magnetisation: B, H, M, χ & μ

The relative permeability of iron is 2000. Its absolute permeability in SI unit will be…MHT CET 2021 (22 Sep, Shift 2)
The permeability of a metal is 0.1256 TmA⁻¹. Its relative permeability will be ((μ₀)/(4π)…MHT CET 2021 (22 Sep, Shift 1)
What is susceptibility of a medium, if its relative permeability is 0.85?MHT CET 2021 (21 Sep, Shift 1)
The magnetic susceptibility of a material of a rod is 499. Permeability in vacuum is 4 π…JEE Main 2021 (20 Jul, Shift 2)
The value of aluminium susceptibility is 2.2 × 10 - 5. The percentage increase in the…JEE Main 2021 (25 Jul, Shift 1)
An iron rod is placed parallel to magnetic field of intensity 2000 A/m. The magnetic flux…MHT CET 2020 (16 Oct, Shift 1)
An iron rod of susceptibility 599 is subjected to a magnetizing field of 1200 A m-1. The…NEET 2020 (Phase 1)
A domain in a ferromagnetic substance is in the form of a cube of side 1. If it contains…MHT CET 2020 (19 Oct, Shift 2)

Magnetisation: B, H, M, χ & μ question from MHT CET 2021 (23 Sep, Shift 1)

More questions on Magnetisation: B, H, M, χ & μ