Question

The dimensions of a block is $100m\times 1m\times 1m$. The specific resistance of the material of the block is $4\times {10}^{-4}\Omega -m$. Calculate its resistance across its square faces.

Answer 1

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

$l=100m$

$b=1m=H$

$A=l\ast b=100$

putting values

$R=4\ast {10}^{-4}\Omega$