Question

What is the resistance of a 3.5m copper wire that has a cross-sectional area of 5.26 x 10-6 m2?

Answer 1

R=ρ$\frac{L}{A}$

Where, R is resistance

ρ is resistivity,

L is length and

A is cross sectional area

Given, L= 3.5m

A=5.26 x 10⁻⁶ m²

ρ=1.68×10⁻⁸ ohms m

∴ R= $\frac{(1.68)(3.5)}{5.26*100}$

⇒ R=1.11×10⁻² ohms

Answer 2

The other guy is right, the answer is 1.1 x 10-²