Materials and Components
When a material is in superconducting state and a magnetic field is applied

The superconducting property may be destroyed
The material may become an insulator
The superconducting property is not affected
The superconducting property may be affected and resistivity may increase from zero to a low value

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Materials and Components
In an intrinsic semiconductor, at a given temperature T

The number of electron hole pairs generated per second due to thermal motion is always more than the number of electron-hole pairs lost per second due to recombination
The number of electron-hole pairs generated per second due to thermal motion is always less than the number of electron-hole pairs lost per second due to recombination
The number of electrons-hole pairs generated per second due to thermal motion are equal to the number of electron-hole pairs lost per second due to recombination
Any of the above

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

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