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Electric field within conductor

  1. Jun 13, 2015 #1
    How come there's no electric field inside a metal cylinder, even though there's positive charge on side and negative charge on the other? For example look at this picture:
    ?temp_hash=d34aae46ff93cad22cc4c966ab4bff9a.png
    As you can see there's is a zero electric field within the cylinder. Why isn't there an electric field that's directed from the + charges within the cylinder to the - charges within it?
     

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  2. jcsd
  3. Jun 13, 2015 #2
    The charges move freely to screen the field, two fields cancel each other.
     
  4. Jun 13, 2015 #3
    The original outside field still penetrates the sphere. It's just that the charges inside the sphere move around and build up a counter-field that exactly cancels that outside field. So, it's the net field that is zero.
     
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