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I have this problem but I cannot figure out the last question.

**A coaxial cable has an inner radius of a and an outer radius of b. between the two conductors is a material with conductivity σ.**

1-Determine the resistance between the two conductors for a one meter length of cable.

1-Determine the resistance between the two conductors for a one meter length of cable.

R=1/(σ*pi*(b^2-a^2))

2- What would be the conductance G be?

2- What would be the conductance G be?

G=σ*pi*(b^2-a^2)

**3- What would be the conductance be for a 100 [m] length cable?**

G=σ*pi*(b^2-a^2))/100

**4-Explain why the cable is characterized by a conductance per unit of length**(not a resistance per unit of length)

I have no sure answer for it.

I would say to avoid to have infinite resistance if a tends to b!!??

Please can someone help me with this question?