Materials and Components
The rule that resistivity of conductors can be separated into two parts viz. temperature independent and temperature dependent is known as

Debye rule
Curie rule
Matthiessen’s rule
Onne’s rule

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

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

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

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