Materials and Components
The fact that domains exhibits spontaneous magnetisation is

Curie-Weiss law
Second hypothesis is of Weiss
First hypothesis is of Curie
Boltzmann’s statistics

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

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