Question

Resistance of a conductor of length ${}^{\prime }{x}^{\prime }$ is ${}^{\prime }{r}^{\prime }$. If its area of cross-section is ${}^{\prime }{a}^{\prime }$, What is its resistivity? What is its unit?

Answer 1

Resistivity can be defined as the measure of the resistance of a specific material of a specific size.

$r=\rho \frac{x}{a}$

$\rho$ is the resistivity of the material.

$\Rightarrow \rho =\frac{ra}{x}$