Calculate the resistance of iron if

[looi76]

Homework Statement

A rectangle bar of iron is 2cm by 2cm in cross section. Calculate its resistance if the resistivity of iron is 11 \times 10^{-8}\Omega{m}.

Homework Equations

R = \frac{Pl}{A}

The Attempt at a Solution

R = \frac{Pl}{A}

A = 2 \times 2 \times 10^-4 = 4 \times 10^{-4}m
P = 11 \times 10^{-8}\Omega{m}

How is it possible to find the resistance If I don't have the length?

 

[G01]

How is it possible to find the resistance If I don't have the length?

It isn't.

Maybe they are looking for the resistance per unit length:

\frac{R}{\ell}=\frac{\rho}{A}