Materials and Components
In solid insulator materials having only one kind of atom, the types of polarization which exist are

Electronic only
Electronic, ionic and permanent
Electronic and ionic

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is a very small fraction of the number of valence electrons
Is about half the number of valence electrons
Is almost equal to the number of valence electrons
Is small as compared to the number of valence electrons

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