 #1
godiswatching_
 12
 1
 Homework Statement:
 Homework statement in the image.
 Relevant Equations:

$$R=\rho\frac{l}{A}$$
$$l=2\pi r$$
Hey! I had a question about this problem.
I did (1) Using
$$R_{0}=\rho\frac{l}{A}$$
For (2) I assume the question means that the radius increases by a meter.
So I used $$\bigtriangleup L = 2\pi (r_{E}+1)  l$$
and then I used that L to find the new R. Then I said $$\bigtriangleup R = RR_{0}$$
Does that seem right? This seems too simple to be right.
My final answer was:
$$\bigtriangleup R = 3.4 \cdot 10^{4} \Omega$$
I did (1) Using
$$R_{0}=\rho\frac{l}{A}$$
For (2) I assume the question means that the radius increases by a meter.
So I used $$\bigtriangleup L = 2\pi (r_{E}+1)  l$$
and then I used that L to find the new R. Then I said $$\bigtriangleup R = RR_{0}$$
Does that seem right? This seems too simple to be right.
My final answer was:
$$\bigtriangleup R = 3.4 \cdot 10^{4} \Omega$$