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

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

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Materials and Components
Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

In a direction anti parallel to magnetic field
In the same direction as current
None of these
Normal to both current and magnetic field

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