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

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

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Materials and Components
At room temperature the number of conducting electrons in an intrinsic semiconductor

Is about half the number of valence electrons
Is small as compared to the number of valence electrons
Is almost equal to the number of valence electrons
Is a very small fraction of the number of valence electrons

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