Question

Conductivity of a conductor depends upon

• A. Length
• B. Area of cross-section
• C. Volume
• D. Temperature

Answer 1

The correct option is D

Temperature

Explanation

1. We know the resistance of any substance $R=\frac{\rho L}{A}$.
2. Where $\rho$ is called resistivity and its reciprocal is called conductivity.
3. $L$is the length of the substance.
4. $A$ is the cross-sectional area.
5. So we see that resistivity and therefore conductivity has no dependence on length, cross-sectional area or volume.
6. In fact, conductivity depends upon the temperature.

So, the correct option is (D) Temperature.