Need help with electromagnetics

  • Thread starter Thread starter vptran84
  • Start date Start date
  • Tags Tags
    Electromagnetics
Click For Summary
The discussion focuses on calculating the capacitance per unit length of a coaxial transmission line with two dielectric layers. The user seeks guidance on determining charge (Q) and voltage (V) to find capacitance, acknowledging confusion with the relevant equations. They mention the relationship C = Q/V and express uncertainty about the integration process required for their solution. A resource link is provided for additional reference on coaxial cables. Assistance in navigating the equations and concepts of electromagnetics is requested.
vptran84
Messages
46
Reaction score
0
Hi,

once again i need help with electromagnetics. if anyone can help, it would be greatly appreciated.

here is the problem:

The radius of the core and the inner radius of the outer conductor of a very long coaxial transmission line are r(i) and r(o), respectively. The space between the conductors is filled with two coaxial layers of dielectrics. The dielectric constants of the dielectrics are Epsilon(1) for r(i)<r<b. and Epsilon(2) for b<r<r(o). Determine it's capacitance per unit length.

From what i already know, the Capacitance=Q/V. So in order to find Q and V, we have to find the integral of Q and V? CAn someone point me to the right direction? I'm so lost in electromagnetics, i don't even know which equations to use.
 
Engineering news on Phys.org
I am trying to understand how transferring electric from the powerplant to my house is more effective using high voltage. The suggested explanation that the current is equal to the power supply divided by the voltage, and hence higher voltage leads to lower current and as a result to a lower power loss on the conductives is very confusing me. I know that the current is determined by the voltage and the resistance, and not by a power capability - which defines a limit to the allowable...

Similar threads

Replies
1
Views
1K
  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 19 ·
Replies
19
Views
2K
  • · Replies 9 ·
Replies
9
Views
2K
Replies
5
Views
3K
  • · Replies 8 ·
Replies
8
Views
6K
  • · Replies 9 ·
Replies
9
Views
2K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 7 ·
Replies
7
Views
4K
Replies
76
Views
10K