6. In Lecture 7 we have learned the electric polarization of materials, while in Lecture 10 we have learned the magnetization of materials. Make a table to compare the phenomena of electric polarization and magnetization. In particular, map the electric quantities (E, P, D, , ) (and their relations) to the magnetic quantities (B, H, M, , ) that play similar roles. (Hint: try to make the relations symmetrical in the mapping.)