The resistivity of a wire varies with which of the following?

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Length

Cross-section

Mass

Material

answer is D.

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Detailed Solution

Concept: Before we get into the meat of the matter, let's define resistivity. Specific resistivity is another name for resistance. The resistance of a conductor at a given temperature is determined by its length, cross sectional area, and the type of material used to make it.
We can observe that resistance is related to conductor length (l) and inversely proportional to cross section area (A) .

Where is the proportionality constant known as a conductor's resistivity. The resistivity unit in SI is m. The resistivity expression is:

Resistivity can be defined as the resistance of a wire of a certain material of unit length and cross section area. The only thing that determines resistivity is the material.
As a result, even if two materials have the same size, their resistivity will differ.
Temperature is the single factor that affects a material's resistivity.
Hence, the correct option is 4.

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