Question

Calculate the resistivity of the material of a wire of length 1 m and radius 0.01cm resistance of 20 ohms

Answer 1

wkt R=(rho)*l/A
where R= resistance
(rho)=resistivity
l= length
A=area
so (rho)=R*A/l
= 20*3.14*0.01/1
=0.628