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

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

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