In a linear, stationary, isotropic, homogeneous, only time-dispersive medium one usually writes Ohm's law as:
$$\underline{\mathcal{J}}(\underline{r},\omega)=\sigma(\omega) \underline{\mathcal{E}}(\underline{r},\omega)$$ where $\mathcal{J}(\underline{r},\omega)$ is the current density (and so, movement of charges) that is function of the point $\underline{r}$ and the frequency of the EM field $\omega$, $\sigma(\omega)$ is the conductibility (so, in other words, the limit velocity acquired by charges when they feel a field at frequency $\omega$) and $\underline{\mathcal{E}}(\underline{r},\omega)$ is obviously the electric field.
My question: why does charges movement (read $\underline{\mathcal{J}}(\underline{r},\omega)$) is independent of magnetic field $\underline{\mathcal{B}}(\underline{r},\omega)$?
I think that when $\omega \neq 0$, the charges movement is not parallel to the electric field, but it makes alternating rotations imposed by magnetic field.
But Ohm's law works so well, so it's me that have a problem. Can you help me?