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Homework Help: Doubt about Electric Field calculations

  1. Jan 6, 2016 #1
    1. The problem statement, all variables and given/known data
    Find the magnitude of an electric field intensity at a distance 12.9 cm, from the axis of a long, straight conductor, which has a radius 3.82 cm, and a charge density of 1.61 C/m.

    2. Relevant equations
    Gauss's law

    3. The attempt at a solution
    E= λ/2πrε0

    Hello, I'm having some troubles understanding this question. To find E i would simply use the 12.9 cm radius, convert it into meters and use the above equation but if I do so I won't need the other information given of the radius of the conductor.
    Do you agree with me? or should I add the 12.9 + the 3.82 radius and put that value into the equation?
  2. jcsd
  3. Jan 6, 2016 #2


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    The problem clearly states that the 12.9 cm distance is the distance from the axis. The 3.82 cm information is a red herring.
  4. Jan 6, 2016 #3
    thank you!
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