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Dielectric & its properties

'Di' for "opposing" and 'electric' for "electric current".
 So a material is defined as dielectric material if it doesn't conduct electric current and opposes the flow of current. An ideal dielectric material doesn't contain free electrons. There exists a large forbidden gap between valence band and conduction band. That is why the charges are well bounded and can't be set in motion easily. 

A material is defined as dielectric material if
  
Properties: 


                       Conductivity is zero; σ = 0

                       Volume charge density is zero; ρv =0

                      Resistivity is infinity

                       Electric and magnetic fields exist in a dielectric

                      Electric and magnetic fields penetrate the dielectric material freely.
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