Practice question

**Magnetization M** is magnetic moment per unit volume (A/m), magnetic intensity H = B/μ₀ - M, susceptibility χ = M/H dimensionless, permeability μ = B/H = μ₀(1+χ), relative permeability μ_r = μ/μ₀ = 1+χ. For solenoid with core, B = μ₀ μ_r n I, n turns per meter (m⁻¹), I current (A). In a non-uniform field, the field strength varies across the dipole, causing the forces on its poles to differ in magnitude. This imbalance results in a net force, unlike in a uniform field where the forces cancel out. Substituting values gives The field strength varies spatially, which matches expected magnitude for this magnetic