Practice question

Given: What is the magnetic field at a point on the equatorial line of a bar magnet with magnetic moment 2 A m² at a distance of 10 cm from its nter? (Take μ_0 = 4π × 10⁻⁷T m A^{-1 ). These values define the system as per NCERT data. Formula: The magnetic field on the equatorial line is B = μ_0/4π m/r³. This is standard NCERT relation. Substitution & Calculation: Given: m = 2 A m², r = 0.1 m, μ_0/4π = 10⁻⁷T m A^{-1 . Substitute: B = 10⁻⁷ × 2/(0.1)³ = 10⁻⁷ × 2/0.001 = 2 × 10⁻⁴T . Result: The computed value matches expected outcome and confirms correct choice as per NCERT.