Question

Define the term 'conductivity' of a metallic wire. Write its si unit. (b).Using the concept of free electrons in a conductor, derive the expression for the conductivity of a wire in terms of number density and relaxation time. Hence, obtain the relation between current density and the applied electric field e.

Answer 1

a) reciprocal of resistivity
$\frac{1}{p}$
where p is resistivity