Answer to Question #301968 in Electric Circuits for Diablo

Question

A rectangular bar of carbon is 1cm by 1cm cross sectional area and 50cm long.

I. Find the resistance between it's square end.

II. The resistance between two opposite rectangular phase. Resistivity= 3.5x10^-5ohms

Answer 1

Answer

resistance is given by

$R=\frac{\rho l}{A}\\=\frac{3.5*10^{-5}*0.50}{0.0001}\\=0.175\Omega$