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Physics -- my last resort

C

chibiblue

Junior Member
Hey, I'm really sorry for posting a physics problem on this forum, but really -- I've been staring at this problem for a while now, and I'm incredibly stuck. Could anyone possibly help me out?

An infinite line of charge with linear density -3 µC/m is positioned along the axis of a thick conducting cylindrical shell of inner radius a = 2 cm and outer radius b = 3 cm and infinite length. The conducting shell has a net charge (inner and outer surfaces) per unit length along its symmetry axis of 5 µC/m.

Calculate the net radial electric field component at r=1cm and r=6cm

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I've already calculated the surface charge densities on the inner and outer surfaces of the cylindrical shell is 2.38e-5 C/m^2 and 1.06e-5 C/m^2, respectively. What the hell do I do now?

I'm completely stuck.
 
I already used Gauss's Law to find the charge densities; I just have to solve some sort of infinite line-charge problem. But which infinite line charge problem is it talking about?
 
This sounds like the stuff I did in Physics 102 but I forgot most of it except for a few key concepts.

Just wanted to say hi. Welcome to the forums. 🙂
 
There's basically a cylinder of infinite length, and at the center, there's an infinite line charge in the center.

You know, I really hate taking summer classes. At least the class curve seems to be better in the summer though. It's ok if you guys can't help out though; I've already gotten 56/60 points for this assignment. Just scraping for a few more points at the last minute =)
 
Integrate using Gauss' law. The infinity makes things cancel nicely amd give you an easy equation.
 
Originally posted by: gopunk
bump for a rl friend 😛

she's a girl btw *wink wink nudge nudge*
Click to expand...


pics?

*wink wink nudge nudge*


<-- physics problem is over his head, but pics would be welcome
 
Highschool physics, as I remember, was a lot more fun than this. I think my college simply has a bad physics program.
 
Originally posted by: chibiblue
Highschool physics, as I remember, was a lot more fun than this. I think my college simply has a bad physics program.
Click to expand...
All I know is that you've got the same instructor I had last summer and he sucks.
 
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