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

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

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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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