A I need to understand the following E&M points

[madmax87]

dear all

i need the help in understanding the following points:

1- In E&M, what is happening (physically) at anomalous absorption?, and how is this explained by the form of permittivity (real and imaginary parts)?
2- why did the "electric displacement" call that way?

 

[Simon Bridge]

Welcome to PF;
To understand something, instead of just memorizing the "correct" answer, you have to think your way through it - we cannot just tell you.
So:

1. what would absorption normally be when it is not anomalous? what do the real and imaginary parts of permittivity signify?
2. when the electric displacement field is useful, what is being displaced?
(Basically the name is an accident of history that we seem to be stuck with.)

If you do not know the answers, try looking them up.