E-field for infinitely long cylinder

1. Feb 27, 2005

LakeMountD

ifthis is an infinitely long cylinder how can i derive an equation for finding the magnitude of the electric field? i have the answer which is E=2*pi*rho*K*r but i dont understand how they got it.

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Last edited: Feb 27, 2005
2. Feb 27, 2005

vincentchan

did you try using gauss' law?.... it is straight forward.... draw a picture, pick a reasonable gauss' surface, and do the simple math (no need calculus)

3. Feb 27, 2005

Staff: Mentor

Use Gauss's law and take advantage of symmetry.

4. Feb 27, 2005

LakeMountD

i did but we are getting the wrong answer when we cancel things out.. thats why i was asking here.

5. Feb 27, 2005

Staff: Mentor

Show your work and we can take a look.