Materials and Components
In a metal, the valence electrons

Are shared only between neighbouring atoms
Are not shared
Either B or C
Are shared by all atoms

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

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

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