Electric field with dielectric constant

  • #1

Homework Statement


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 Without disconnecting the battery, the Mylar is withdrawn.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 What is the charge before and after the Mylar is withdrawn?
What is the electric field before and after the mylar is withdrawn?

Homework Equations


C={k(epsilon_o)A}/d
Q=CV
C=kC_o


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.
 

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