Question

Write the expression of resistivity of a conductor. State
its S.I. unit.​

Answer 1

$\huge{\mathcal{\boxed{\blue{solution}}}}$

$\large{\blue{Resistivity}}$

$r = \frac{resistance \times length}{area \: of \: cross \: section}$

❤S.i unit

$\huge{\mathcal{\boxed{\orange{ohm\:metre}}}}$

Answer 2

Definition:

        Conductivity defines a material's ability to conduct electricity. Electric current can flow easily through a material with high conductivity.Materials are classified as metals, semiconductors, and insulators.

SI Unit: 

     The SI unit of conductivity is siemens per meter (S/m) and is often represented using the Greek letter σ.

Hope this will help you.