Factors on Which the Resistance of a Conductor Depends

The resistivity (ohm-metre) of four materials A, B, C and D are $6.84\times {10}^{-8}$, $1.62\times {10}^{-8}$, $5.20\times {10}^{-8}$ and $2.63\times {10}^{-8}$ respectively. Which of these materials has very high electric conductivity?

What is meant by electrical conductivity?

The electrical resistivity and electrical conductivity of a material is the same.

Explain the relation between electrical resistivity and conductivity?

The resistance of a wire of length $10 \mathrm{m}$ is $2 \mathrm{\Omega }$. If the area of cross-section of the wire is $2\times {10}^{-7} {\mathrm{m}}^2$, calculate its electrical conductivity.

Two resistances are of same material and are having same length. If the ratio of their cross-sectional area is $2:11$ then what will be the ratio of their resistances?

Define resistivity.

How resistance depends upon cross section area?

What is the unit of specific resistance or resistivity?

Resistivity depends on which of the following?

Imagine you have a conductor. The cross sectional area of the conductor is increased by $2$ and the length of the conductior is made twice. If the initial resistance was R, what is the final resistance?