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

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

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Materials and Components
With increase in temperature, the electrical conductivity would

Decrease in metals as well as in intrinsic semiconductor
Increase in metals as well as in intrinsic semiconductor
Decrease in metals but increase in intrinsic semiconductor
Increase in metals but decrease in intrinsic semiconductor

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