While studying electron drift through a metallic conductor, what is conductivity (σ) of the material equal to? (Where e is charge on an electron, m ismass of an electron, E is the electric field, τ is relaxation time and n is the number of free electrons per unit volume)

While studying electron drift through a metallic conductor, what is co

1.	While studying electron drift through a metallic conductor, what is conductivity (σ) of the material equal to? (Where e is charge on an electron, m ismass of an electron, E is the electric field, τ is relaxation time and n is the number of free electrons per unit volume)
A.	ne2τE/m
B.	ne2τ/m
C.	σE
D.	eτ/m
Answer» C. σE