Question

9. Define the term electrical resistivity of a material. ​

Answer 1

Answer:

The electrical resistivity of a material is also known as its specific electrical resistance. it is a measure of how strongly a material opposes the flow of electric current .

Answer 2

Answer:

For it's definition, first let me tell you a formula from which we define it.

$R=\rho{l\over A}\\\\~~~~~~~where,\\~~~~~~~~~~R=Resistance\\~~~~~~~~~~\rho=Resistivity\\~~~~~~~~~~l=Length\\~~~~~~~~~~A=Cross-section~area$

Hence,

$\rho=R{A\over l}$

In this formula, If $l$ and $A$ are replaced by 1 metre and 1 m² (Unit length and Unit Volume) respectively, $\rho=R$

Hence, Resistivity $(\rho)$ of a material is defined as Resistance $(R)$ of that material which has dimensions of 1 metre length and 1 m² area. (i.e., a cube with side 1 metre)