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Q.

Electrical resistivity of a material depends on the


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a

nature of the material

b

temperature of the material

c

the pressure exerted on the material to a small extent.

d

All of the above 

answer is D.

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Detailed Solution

The electrical resistivity of a material depends on the nature of the material, temperature and the pressure exerted on the material to a small extent.
The resistivity of a substance is the characteristic property of its material, on which the resistance of a substance depends. Electrical resistivity, also known as specific electrical resistance, is a fundamental property of a substance that determines how effectively it resists electric current. A material's electrical resistivity depends on the material's nature, temperature and the pressure exerted on the material to a small extent. The relationship between resistivity and temperature is indirect. Materials' resistivities will decrease as their temperatures rise. However, not every material has the same dependence on temperature, so this is not always the case. Also, resistivity depends on the nature of the material, as different materials have different resistivity. A material's resistivity changes when it is subjected to light pressure because the molecular arrangements change. In general, the resistivity is found to decrease with increasing pressure.
 
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