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

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

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Materials and Components
The residual resistivity of a binary alloy at 0 K is

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

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Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

Low thermal conductivity and low melting pointL
High thermal conductivity and low melting point
High thermal conductivity and high melting point
Low thermal conductivity and high melting point

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