- #1
brad sue
- 281
- 0
Hi ,
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.
R=1/(σ*pi*(b^2-a^2))
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?
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.
R=1/(σ*pi*(b^2-a^2))
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?