Materials Science: Unit II(b): Magnetic Properties of Materials
Anna University Solved Problems
Magnetic Properties of Materials | Materials Science
Anna University Solved Problems: Electrical and Magnetic Properties of Materials - Materials Science
ANNA UNIVERSITY SOLVED PROBLEMS Problem 2.12 The magnetic field strength of copper is ampere / metre. If the magnetic susceptibility of copper is - 0.8 × 10-5, calculate the magnetic flux density and magnentisation in copper. Given data Magnetic field strength H = 106 Am-1 Magnetic susceptibility of copper χ = -0.8 × 10-5 Solution Problem 2.13 A magnetic field of 1800 ampere/metre produces a magnetic flux of 3 × 10-5 weber in an iron bar of cross sectional area 0.2 cm2. Calculate magnetic permeability. Given data Magnetizing field H = 1800 Am-1 Magnetic flux ϕ = 3 × 10-5 weber Area of cross section A = 0.2 cm2 = 0.2 × 10-4 m2 Solution Magnetic flux density B = ϕ/A Substituting the given values, we have Problem 2.14 The saturation magnetic induction of nickel is 0.65 weber / metre2. If the density of nickel is 8906 kg / m3 and atomic weight is 58.7, calculate the magnetic moment of the nickel atom in Bohr magneton. Given data Magnetic induction of nickel B = 0.65 wb m-2 Density of Nickel ρ = 8906 kg m-3 Atomic weight (M) - 58.7 μo = 4π × 10-7 Hm-1 Avagadro's number N = 6.023 × 1026 Solution We know that B = Nμo μm N is the number of atoms per unit volume (atoms/m3) Substituting the given values, we have Problem 2.15 A paramagnetic material has bcc structure with a cube edge of 2.5 Å. If the saturation value of magnetisation is 1.8 × 106 ampere / metre. Calculate the average magnetisation contributed per atom in Bohr magneton. Given data Interatomic distance a = 2.5 Å = 2.5 × 10-10 m Magnetisation M = 1.8 × 106 Am-1 Electronic charge 'e' = 1.6 × 10-19 coulomb Planck's constant h = 6.625 × 10-34 Js Solution Number of atoms per unit volume = 1.52 Bohr magneton
Materials Science: Unit II(b): Magnetic Properties of Materials : Tag: : Magnetic Properties of Materials | Materials Science - Anna University Solved Problems
Materials Science: Unit II(b): Magnetic Properties of Materials
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