How can a question on Penetration of electromagnetic waves in insulators? be classified as engineering?
To be sure, the only answer seems to have focused on some particular issues that some might consider "engineering", but what was actually asked was a general question about the attenuation of electromagnetic waves in insulators, i.e. dielectrics. This is a topic covered in a myriad of courses and texts on classical electromagnetism taught and written by physicists. Should any question on index of refraction also be rejected as engineering, since it is also a concept used by engineers and involves electromagnetic waves in dielectric media?