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Homework Help: Gauss' Law Problem

  1. Nov 3, 2008 #1
    1. The problem statement, all variables and given/known data
    A very long, solid insulating cylinder with radius R has a cylindrical hole with radius
    a bored along its entire length. The axis of the hole is a distance b from the axis of the
    cylinder, where a < b < R. The solid material has a uniform volume charge density, ρ. Find
    the magnitude and direction of the electric field inside the hole.

    2. Relevant equations
    Gauss' Law

    3. The attempt at a solution
    I don't understand why the electric field inside the hole is 0. I mean there is no charge so therefore there is no net electric field. However this isn't what my book gives as an answer..
  2. jcsd
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