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

The superconducting property may be destroyed
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

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Materials and Components
Hall effect is observed in a specimen (metal or semi conductor) when it is carrying current and is placed in a magnetic field. The resultant electric field inside the specimen is

In the same direction as current
In a direction anti parallel to magnetic field
Normal to both current and magnetic field
None of these

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Materials and Components
The residual resistivity of a binary alloy at 0 K is

Difference of residual resistivities of component metals
Product of residual resistivities of component metals
Sum of residual resistivities of component metals
Dependent on the concentration of minor component in the alloy

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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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