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

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

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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 less 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 more 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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