\(S=\pi\dfrac{d^2}{4}=\pi\dfrac{2^2}{4}=3,14\left(mm^2\right)\)
\(R=\rho\dfrac{l}{S}\Rightarrow\rho=\dfrac{R.S}{l}=\dfrac{11.3,14.10^{-6}}{20}=1,727.10^{-6}\left(\Omega.m\right)\)
\(S=\pi\dfrac{d^2}{4}=\pi\dfrac{2^2}{4}=3,14\left(mm^2\right)\)
\(R=p\dfrac{l}{S}\Rightarrow p=\dfrac{R.S}{l}=\dfrac{11.3,14.10^{-6}}{20}=1,727.10^{-6}\Omega m\)