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

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

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Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

Low thermal conductivity and low melting pointL
Low thermal conductivity and high melting point
High thermal conductivity and low melting point
High thermal conductivity and high melting point

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