Which of the following is /are the factors on which the resistance of a conductor depends?

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Resistivity of the material

Length of the conductor

Cross-sectional area of the conductor

All of these

answer is D.

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Detailed Solution

The factors on which the resistance of a conductor depends are the resistivity of the material, the length of the conductor and the cross-sectional area of the conductor.
Electrical resistance is inversely proportional to the cross-sectional area (

A

) and directly proportional to the length of the conductor (

L

). Thus electrical resistance,

R \propto \frac{L}{A}

\Rightarrow

R = ρ \frac{L}{A}

Where

ρ

denotes the resistivity of the material, it depends on other physical elements, such as temperature, etc.

Ohm (Ω)

is its SI unit.

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