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

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Materials and Components
With increase in temperature, the electrical conductivity would

Increase in metals but decrease in intrinsic semiconductor
Increase in metals as well as in intrinsic semiconductor
Decrease in metals as well as in intrinsic semiconductor
Decrease in metals but increase in intrinsic semiconductor

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

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

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