Materials and Components
The fact that domains exhibits spontaneous magnetisation is

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

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

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