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Find resistance of copper wire. 
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#1
Sep1310, 08:32 PM

P: 5

1. The problem statement, all variables and given/known data
Find the resistance of a 1.4 m length of copper wire with diameter of 5*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? 


#2
Sep1510, 01:05 PM

P: 5




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