Materials and Components
The elements which become superconducting at extremely low temperatures are

Relatively poor conductors at room temperature
Insulators at room temperature
Ferromagnetic at room temperature
Good conductors at room temperature

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Materials and Components
Electrical contact materials used in switches, brushes, relay must possess

Low thermal conductivity and low melting pointL
High thermal conductivity and high melting point
Low thermal conductivity and high melting point
High thermal conductivity and low melting point

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