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
The residual resistivity of a binary alloy at 0 K is

Sum of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy
Difference of residual resistivities of component metals
Product of residual resistivities of component metals

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