The analysis demonstrated that the electric susceptibility ($\chi_j^i$) in an anisotropic medium is a rank two tensor. In such media, the polarization vector $\mathbf{P}$ and the electric field vector $\mathbf{E}$ are linearly related by $P^i = \epsilon_0 \chi_j^i E^j$ using the summation convention. The proof relies on showing that $\chi_j^i$ adheres to the mixed-tensor transformation law for a rank two tensor: $\chi_j^{\prime i} = \frac{\partial x^{\prime i}}{\partial x^k} \frac{\partial x^l}{\partial x^{\prime j}} \chi_l^k$. This was achieved by substituting the known contravariant vector transformation laws for $\mathbf{P}$ and $\mathbf{E}$ into the defining constitutive relation and isolating the transformation factor for $\chi_j^i$.

🎬Demo

https://youtu.be/Xs2Ph_EJAOA


📎IllustraDemo

A derivative illustration based on our specific text and creative direction

A derivative illustration based on our specific text and creative direction


🏗️Structural clarification of Proof and Derivation

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