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

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

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Materials and Components
An atom of a rare gas is placed is an electric field E. Then

The nucleus will be shifted in the direction of E by an amount which is independent of E.
The nucleus will be shifted in a direction opposite to that of E.
The nucleus will not be shifted.
The nucleus will be shifted in the direction of E by an amount which is proportional to E.

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