# the polarisation is proportional to the electric field within an isotropic medium that is contrary

The animation demonstrates that in an isotropic medium, the polarization $$\vec{P}$$ is always parallel and proportional to the electric field $$\vec{E}$$. In contrast, a non-isotropic medium can cause $$\vec{P}$$ to vary in both direction and magnitude, showing that the response to $$\vec{E}$$ depends on the material's internal structure.

{% embed url="<https://youtu.be/Xs2Ph_EJAOA>" %}

{% embed url="<https://viadean.notion.site/Tensor-Analysis-of-Electric-Susceptibility-in-Anisotropic-Media-2731ae7b9a32800cb84de7f4d4b25b99?source=copy_link>" %}