Question

2 meter of resistance wire of Cross section .5mm² has a resistance of 2.2ohm c calculate the resistivity of the meter

Answer 1

$$R=\rho\frac{l}{A}$$

$$\rho=\frac{RA}{l}\\ =\frac{2.2*0.5*10^{-6}}{2}=5.5*10^{-7}\:\rm \Omega\cdot m$$