Practice question

Given: The magnetic field contribution B_m due to a material with M = 2.5 × 10⁵A m^{-1 is: (Take μ_0 = 4π × 10⁻⁷T m A^{-1 ). Formula: B_m = μ_0 M. Substitution & Calculation: Given: M = 2.5 × 10⁵A m^{-1, μ_0 = 4π × 10⁻⁷. B_m = 4π × 10⁻⁷ × 2.5 × 10⁵= 0.314 T approx 0.31 T . Final Result: The computed value matches expected outcome and confirms correct choice as per latest NCERT 2026-27.