Practice question

**Ferromagnetism** shows large positive χ ≈ 10³ to 10⁵, strong attraction, domain structure with spontaneous magnetization, hysteresis, retentivity. Distinction based on sign and magnitude of χ and behaviour in non-uniform field, explaining attraction versus repulsion. Ferromagnetic materials greatly enhance the magnetic field inside them due to the strong alignment and growth of magnetic domains, resulting in a high susceptibility and permeability, far exceeding that of paramagnetic or diamagnetic materials. Substituting values gives Ferromagnetic, which matches expected magnitude for this magnetic configuration, confirming dipole field dependence on m/r³ and torque relation τ = m B sinθ.