Posted by **David D.** on Tuesday, September 14, 2010 at 2:06am.

A long, thin straight wire with linear charge density -λ runs down the center of a thin, hollow metal cylinder of radius R. The cylinder has a net linear charge density 2λ. Assume λ is positive. Find expressions for the electric field at the following locations. Use lambda for λ, pi for π, epsilon_0 for ε0, r for r, and R for R.

(b) outside the cylinder, r > R

- physics -
**drwls**, Tuesday, September 14, 2010 at 2:15am
Use Gauss' law. Because of symmetry, the E field will be radially outward and a function of r only.

The product of E and the area of any imaginary concentric cylinder (Gauss' law surface) outside r = R is equal to the charge inside the cylinder, divided by epsilono. E will be inversely proportional to r.

Review or use Google look up Gauss' law if you are unfamiliar with it. Here is one good reference among many:

http://teacher.pas.rochester.edu/phy122/Lecture_Notes/Chapter24/Chapter24.html

## Answer this Question

## Related Questions

- Physics Gauss - A long, thin straight wire with linear charge density -λ ...
- Physics - Monochromatic light of wavelength, λ is traveling in air. The ...
- Calculus - My question is finding the derivitive of y=((x+λ)^4)/(x^4+λ...
- Physics - An infinitely long line charge of uniform linear charge density λ...
- Physics - An infinitely long line charge of uniform linear charge density &#...
- Physics - A long thin rod lies along the x-axis from the origin to x=L, with L= ...
- Physics - A long thin rod lies along the x-axis from the origin to x=L, with L= ...
- Physics - please help!!.. - A long thin rod lies along the x-axis from the ...
- physics - A long thin rod lies along the x-axis from the origin to x=L, with L= ...
- Physics - A non-conducting ring of radius R with a uniform charge density λ...

More Related Questions