Which of the following represents Ohm's law for a conducting material?

The correct answer is Option (2) → $\vec J =σ\vec E$

$\vec J =σ\vec E$

It is a microscopic form of ohm's law-

$\vec J$ = Current density $(A/m^2)$

$σ$ = Electrical conductivity of material

$\vec E$ = Electric field