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Homework Help: Electric field in all regions of infinite cylinder

  1. Apr 22, 2014 #1
    1. The problem statement, all variables and given/known data

    A uniform linear charge of λ is located along the z axis, and concentric circular cylinder of radius 2 [m] has a surface distribution charge of α . both distributions are infinite, the distribution of linear charge is contained in the interior of the circular cylinder as shown image.


    λ = 3 * 10^-3 (C/M)
    σ = 1.54pi * 10^-3 (C/M^2)

    Determine E, in all regions

    2. Relevant equations

    3. The attempt at a solution

    so i was wondering if these are the formulas that i have to use in order to solve this problem

  2. jcsd
  3. Apr 22, 2014 #2

    rude man

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    You haven't identified a.

    Is the red part a wire, a solid cylindrical dielectric section or a cylindrical shell section?
  4. Apr 22, 2014 #3
    i think its a wire or a rod and "a" would be the radius of the cylinder, so my question would be since the problem gives you the surface charge of the cylinder

    the total charge for r>a would be λL+ ρ*2∏*r*L ?
    Last edited: Apr 22, 2014
  5. Apr 23, 2014 #4

    rude man

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    No, the total charge (per length L) is not a function of r if r>a. Besides, you're supposed to find E(r).

    I changed your "ρ" to a "σ".
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