  The magnetic force is retained in the Lorentz Oscillator Model and a
perturbation solution is derived beyond the dipole approximation. Perturbation
series for the electric dipole, magnetic dipole, and electric quadrupole
moments in addition to their macroscopic, spatially-averaged counterparts are
also obtained. These expressions are shown to describe many optical phenomena:
the normal, linear Zeeman, Faraday, and magneto-optic Kerr effects, the linear
Stark, Pockels, and Kerr effects (when the restoring force is anharmonic), the
momentum and angular momentum of a photon in matter (contributing to the
Abraham-Minkowski debate), the photon drag and inverse Faraday effects, and
sum-frequency and second-harmonic generation in centrosymmetric media. The
qualitative and quantitative accuracy is assessed by comparison to both
experiment and more fundamental theory (e.g. quantum mechanics). New insights
into the relationship between the Stark and Pockels/Kerr effects also emerge.
