Conductor and dielectrics electromagnetics

The condition for a good conductor is given by

Relaxation time is less in dielectrics

The following conditions defines a linear medium

The condition  on conductivity for a medium to be a good dielectric

If the electric flux density and the electric field intensity are not in the same direction the medium is called anisotropic medium

The relaxation time of a dielectric is given by

The power factor of a dielectric is given by

The resistance of a conductor of uniform cross section s is given by

The attenuation in a good dielectric medium is given by