Materials and Components
For making a capacitor it is better to have a dielectric having

Permittivity which is neither high nor low
High permittivity
Permittivity same as that of air
Low permittivity

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

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

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