Question

calcule a resistividade de um material de resistencia de 2ohm com 1m de comprimento de 2mm² em ohm.metro

Answer 1

$\boxed{R = \frac{\ _p*l}{A}}\\\\\ R = 2\ ohm\\ l = 1\ m\\\\ A = 2\ mm^2 = 2.10^-^6\ m^2\\\\\ 2 = \frac{\ _p*1}{2.10^-^6}\\\\\ \boxed{_p = 4.10^-^6\ ohm/m}$