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Electromagnetism –revising with past exam papers

  1. May 14, 2017 #1
    1. The problem statement, all variables and given/known data
    upload_2017-5-14_14-24-33.png
    trying to do question C

    2. Relevant equations
    I know my answer to C cannot be right because it's worth six marks, any help or tips would be greatly appreciated. :)

    3. The attempt at a solution
    upload_2017-5-14_14-33-27.png
     
  2. jcsd
  3. May 14, 2017 #2

    TSny

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    Check to see if you have the correct relation between D and E.
     
  4. May 14, 2017 #3
    thanks TSny you're right I have got that the wrong way round, Im more perplexed by question c though, how to find the free surface density, if I had the correct value for the displacement field of the dielectric would my answer for c be right? I'm assuming it wouldn't as it's awarding 6 marks, so must be more complex.
     
  5. May 14, 2017 #4

    TSny

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    I think your answer for (c) would be correct once you use the correct expression for D in terms of E. Maybe they feel that (c) requires more conceptual thought in using Gauss's law for D.
     
  6. May 14, 2017 #5
    ok great thanks TSny
     
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