1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

EMF Shielding

  1. Oct 31, 2007 #1
    Your opinion to the following will be appreciated

    Lets imagine a sphere made of a conductor (copper) placed within a
    static magnetic field. The field will penetrate the within the shier.
    Next we place inside the sphere a coil producing a variable
    electromagnetic field. The electromagnetic field can not escape out
    side the sphere due to shielding effect of the cooper sphere.

    The question is: Taking in consideration the shielding effect created
    by the variable electromagnetic field within the shier, can the static
    magnetic field penetrate within the shier?
     
  2. jcsd
  3. Nov 2, 2007 #2
    On Wed, 31 Oct 2007 05:51:35 +0000 (UTC), Efthimios
    <eangelopoulos@gmail.com> wrote:

    >Your opinion to the following will be appreciated
    >
    >Lets imagine a sphere made of a conductor (copper) placed within a
    >static magnetic field. The field will penetrate the within the shier.
    >Next we place inside the sphere a coil producing a variable
    >electromagnetic field. The electromagnetic field can not escape out
    >side the sphere due to shielding effect of the cooper sphere.


    A static magnetic field will remain unaffected.

    For the variable em field the shielding effectiveness is limited.
    There will be a certain amount of leaking through the shield,
    dependent on frequency, wall thickness, conductivity, and so on.
    We usually calculate damping factors in deziBel values, "dB".

    >
    >The question is: Taking in consideration the shielding effect created
    >by the variable electromagnetic field within the shier, can the static
    >magnetic field penetrate within the shier?


    Yes, the two fields do not affect each other.
    We cannot shield a static magnetic field by applying
    a high-frequency radiation to the shield.

    w.
     
  4. Dec 20, 2007 #3
    Solve your problem

    If you want to solve your EM problem you can take a look in here.

    You can request a catalog and a sample package for free, and buy EM materials if needed.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: EMF Shielding
  1. EM shielding (Replies: 4)

  2. Magnetic shielding (Replies: 4)

  3. HV Shielding (Replies: 12)

  4. Rediarion shielding (Replies: 4)

Loading...