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Homework Help: Charge on a Cylinder

  1. Jan 28, 2017 #1
    1. The problem statement, all variables and given/known data
    The figure is a section of a conducting rod of radius R1 = 1.60 mm and length L = 11.30 m inside a thin-walled coaxial conducting cylindrical shell of radius R2 = 10.5R1 and the (same) length L. The net charge on the rod is Q1 = +3.67 × 10-12 C; that on the shell is Q2 = -2.04Q1.

    What is the charge on the interior and exterior surface of the shell?

    Picture inserted below.

    2. Relevant equations
    I have no idea.

    3. The attempt at a solution
    I don't even know how to start this. I know the answer of the charge on the exterior is the sum of Q1 and Q2, but I don't know how where the answer came from.

    Attached Files:

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  2. jcsd
  3. Jan 29, 2017 #2


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    Science Advisor
    Homework Helper
    2017 Award

    Hello RF,
    Guidelines don't like 'dunno' but I'll give you a hint: what about the ##\vec E## field between inner and outer R2 ? And: learn about Gauss already ?
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