What is effective conductivity?

[Xyius]

What is "effective" conductivity?

In one of my homework problems (This ISNT a homework help question! It is conceptual) It says to find the "effective" conductivity.

What is the difference between conductivity and effective conductivity? Is there any difference?

 

[Bob S]

At higher frequencies, the depth of penetration of a signal into the center conductor of a coaxial cable is limited to the skin depth δ. See http://en.wikipedia.org/wiki/Skin_effect. So if the radius of the center conductor is r, then the effective conducting area is 2 πrδ, which is less than the total conductor area πr².

 

[Xyius]

At higher frequencies, the depth of penetration of a signal into the center conductor of a coaxial cable is limited to the skin depth δ. See http://en.wikipedia.org/wiki/Skin_effect. So if the radius of the center conductor is r, then the effective conducting area is 2 πrδ, which is less than the total conductor area πr².

Thanks a lot!

 

[Vanadium 50]

Is this AC or DC? Is this in simple or composite materials? What is the context.

 

[Xyius]

Is this AC or DC? Is this in simple or composite materials? What is the context.

I was given a wave traveling though a lossy dielectric medium in a transmission line. So this is AC.

 

[Vanadium 50]

Then Bob's answer is right. If it were DC, it would have been something else.