Materials and Components
The resistance of a photoconductor

May increase or decrease with increase in light intensity
Decreases with increase in light intensity
Remains constant
Increases with increase in light intensity

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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

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

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