Question

Define the resistivity of a conductor.

Answer 1

1. Resistance of a material is given by $R=\rho \frac{L}{A}$ , where $\rho$ is a constant called resistivity of the material, L is the length and A is the area of the conductor.
2. Therefore, $\rho =R\frac{A}{L}$
3. If both the area and its length are unity then,

$R=\rho$

Therefore, resistivity is defined as the resistance offered by the conductor of unit length and unit area of the cross-section.