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

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

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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 destroyed
The superconducting property may be affected and resistivity may increase from zero to a low value

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