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

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

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

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