Register to reply

Maximum potential (coaxial cable)

by weesiang_loke
Tags: cable, coaxial, maximum, potential
Share this thread:
Mar23-11, 08:32 AM
P: 33
1. The problem statement, all variables and given/known data
Given a coaxial cable with outer conductor of radius b, and inner conductor of radius a. Prove that maximum potential is obtained when a = b /e, e is base of natural log.

2. Relevant equations
gauss law, ...

3. The attempt at a solution
By using Gauss Law,
for a < r < b,
i have E = 2*k*[tex]\lambda[/tex] / r, where [tex]\lambda[/tex] = Q/L

then the potential difference, V= [tex]\int[/tex] E dr
V = 2*k*[tex]\lambda[/tex] ln (b/a),

but i am not sure how to continue by differentiating V wrt a.
Help me pls...
Thank you.
Phys.Org News Partner Science news on
Wildfires and other burns play bigger role in climate change, professor finds
SR Labs research to expose BadUSB next week in Vegas
New study advances 'DNA revolution,' tells butterflies' evolutionary history
Mar23-11, 08:47 PM
P: 33
Anyone pls help ......

Register to reply

Related Discussions
Coaxial Cable Introductory Physics Homework 6
Capacitance of coaxial cable Introductory Physics Homework 5
Coaxial cable? Introductory Physics Homework 2
Coaxial cable General Physics 0
Vector potential in a coaxial cable Advanced Physics Homework 5