Practice question

**Diamagnetism** exhibits small negative susceptibility χ ≈ -10⁻⁵ to -10⁻⁶, weakly repelled from stronger to weaker field regions, no permanent moment, induced moment opposite to B, present in all materials but dominated by other effects. Superconductor perfect diamagnet with χ = -1, complete field expulsion. Ferromagnetic materials exhibit large, positive susceptibility due to the spontaneous alignment of magnetic domains, which amplifies the magnetization far beyond that of paramagnetic or diamagnetic materials. Substituting values gives Ferromagnetic materials, which matches expected magnitude for this magnetic configuration, confirming dipole field dependence on m/r³ and torque relation τ = m B sinθ.