(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

Find the resistance of a1.4 mlength of copper wire with diameter of5*10^-3 m.

2. Relevant equations

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

3. 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?

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# Find resistance of copper wire.

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