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

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

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

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

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Materials and Components
When a material is in superconducting state and a magnetic field is applied

The material may become an insulator
The superconducting property may be destroyed
The superconducting property may be affected and resistivity may increase from zero to a low value
The superconducting property is not affected

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