Question

What is the resistance of a 1.3 m copper wire ( = 1.7 10-8 m) that has a cross-sectional area of 8.36 10-6 m2?

Answer 1

The resistance of a piece of wire is given by
$R= \frac{\rho L}{A}$
where
$\rho$ is the material resistivity
L is the length of the wire
A is its cross-sectional area

Substituting the data given by the problem, we can find the value of the resistance of the wire:
$R= \frac{\rho L}{A}= \frac{(1.7 \cdot 10^{-8} m)(1.3 m)}{(8.36 \cdot 10^{-6} m^2)}=2.6 \cdot 10^{-3}\Omega$

Answer 2

Answer:2.6x10^-3

Explanation: