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Homework Help: Electric field with dielectric constant

  1. Nov 6, 2008 #1
    1. The problem statement, all variables and given/known data
    Two 5.0mm*5.0mm electrodes with a 0.10mm thick sheet of Mylar between them are attached to a 9.0 V battery. Without disconnecting the battery, the Mylar is withdrawn. (Very small spacers keep the electrode separation unchanged.) Dielectric constant for Mylar is k=3.1. What is the charge before and after the Mylar is withdrawn?
    What is the electric field before and after the mylar is withdrawn?

    2. Relevant equations

    3. The attempt at a solution
    I get the charges correctly but i just cant get the electric field before and after. Charge before is 62 pC and after its 20 pC. Help please.
  2. jcsd
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