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Homework Help: Electromagnetics Specifically depth problems.

  1. Dec 1, 2008 #1
    1. The problem statement, all variables and given/known data

    A plane wave of 1 MHz frequency in free space is incident normally on a copper
    surface [[tex]\sigma[/tex]=5.8*10^7, [tex]\mu[/tex]r=1, and [tex]\epsilon[/tex]r=1]. If the magnetic field strength at the surface is 1 mA m-1, find the depth at
    which it is 2.5% of this value. Calculate the value of electric field on the surface
    of the copper. Make a comment on the total power propagated inside the copper.

    3. The attempt at a solution

    I am mostly concerned with how to find the depth at which the magnetic field is 2.5% of its original value. I simply don't have any resources on how to calculate this. Could anybody point me towards the correct equations? Thanks!
  2. jcsd
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