Question

How do electrical resistivity of metallic conductor vary with temperature?

Answer 1

we have formula

resistivity=m/ne^2t

where

n=number density of electron

e=charge of electron

t=relaxation time

m=mass of electron

now t is inversely proportional to temperature

but t is also inversely proportional to resistivity acc to formula

hence

temperature is directly proportional to resistivity for a metallic conductor

hence when temperature increases resistivity also increases