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Homework Help: Magnitude of an Electric Field in a Cylinder

  1. Jul 15, 2013 #1
    1. The problem statement, all variables and given/known data
    A thin, cylindrical copper shell of diameter ds = 2 cm has along its axis a thin metal wire of diameter dw = 7.50 x 10-03 cm. (as shown in the diagram below.) The wire and the shell carry equal and opposite charges of 6.35 x 10-09 C/cm, distributed uniformly. What is the magnitude of the electric field at a point r = 2.30 mm, where r is measured radially from the center of the inner wire?

    2. Relevant equations

    I think EA = E*2*∏*r*L = (λ*L)/ε0
  2. jcsd
  3. Jul 16, 2013 #2
    Use Gauss law here. Flux = Q(in)
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