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Homework Help: What is the energy density of the electric field ?

  1. Jun 30, 2013 #1
    Two large non-conducting plates of surface area A = 0.25 m^2 carry equal but opposite charges Q = 75 uC. What is the energy density of the electric field between the two plates?


    My attempt:

    E=(charge density)/epsilon

    And
    U=1/2*epsilon*E^2

    So
    U=0.5(charge density)^2/epsilon

    =0.5*(75*10^-6/0.25)^2/(8.85*10^-12)

    =5084.75J/m^3 = 5.1 x 10^3 J/m^3

    is this right?
     
  2. jcsd
  3. Jun 30, 2013 #2
    Your formulas look correct, can't say about the calculations.
     
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