Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Electric field permitivity

  1. Mar 22, 2010 #1
    Do both conductors and insulators allow electric fields through and why?
  2. jcsd
  3. Mar 22, 2010 #2


    Staff: Mentor

    No, conductors block EM waves. That is the principle behind a Faraday cage.
  4. Mar 23, 2010 #3
    hey! Isnt that all about faradays cage is the principle under gaussians law, and by the way why conductors dont allow electric field pass through as the insulators do?
  5. Mar 23, 2010 #4


    User Avatar
    Homework Helper

    The electrons in a conductor are free to move. If there were an electric field, the electrons would accelerate. The only way for a conductor to be at equilibrium is for the electric field to be 0.
  6. Mar 24, 2010 #5
    Thanks man!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook