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EEE224_Fall09_MaterialMedia - METU NCC EEE 224...

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1 EEE 224 ELECTROMAGNETIC THEORY Static Electric Field in Material Media METU - NCC
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2 What about electrostatic fields in a material media ? So far, we considered electrostatic fields in free space (or vacuum). Material Media Material classification: Conductors Dielectrics (or insulators) Semiconductors (in between the two)
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3 Material 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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4 σ : conductivity (Siemens/m) If σ >> 1, good conductor (e.g., metals) Charges flow easily. If σ << 1, good insulator Almost no charge flows.
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