- #1

Spoonerz

- 5

- 0

## Homework Statement

Find the resistance of a

*length of copper wire with diameter of*

__1.4 m__*.*

__5*10^-3 m__## Homework Equations

R = p(L/A) where p = resistivity of copper, L = length, A = area

## The Attempt at a Solution

The resistivity of copper is

__(1.69 * 10^-8)__. Radius is d/2 (5*10^-3) / (2) =

__(2.5*10^-3)__With the radius, the Area A = pi(2.5*10^-3)^2 =

*.*

__(1.96*10^-5)__Plugging it into the equation R = p(L/A)

(1.69*10^-8)*(1.4) / (1.96*10^-5) =

__(1.2*10^-3) Ohm__There were two similar questions like this where the same approach yield me the correct answer. Somehow this answer I get is incorrect. What am I doing wrong?

On a side note, how many questions may I post?