2What about electrostatic fields in a material media?So far, we considered electrostatic fields in free space (or vacuum).Material MediaMaterial classification:ConductorsDielectrics (or insulators)Semiconductors (in between the two)
3Material Media(a) The conductor exhibits no energy gap between the valence and conduction bands.(b) The insulator shows a large energy gap.(c) The semiconductor has only a small energy gap.
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