Practice question

**Torque on magnetic dipole** in uniform field B is τ = m × B, magnitude τ = m B sinθ, m moment (A·m²), B field (T), θ angle between m and B (degrees). Torque tends to align moment with field, zero at θ = 0°, maximum mB at 90°, direction given by right-hand rule. B_m = μ₀ M . Given: M = 3.5 × 10⁵ A m⁻¹ , μ₀ = 4π × 10⁻⁷ . B_m = 4π × 10⁻⁷ × 3.5 × 10⁵ = 0.4396 T ≈ 0.44 T . Substituting values gives 0.44 T, which matches expected magnitude for this magnetic configuration, confirming dipole