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Homework Help: Calculate Displacement Current from Electric Flux Density

  1. Oct 8, 2013 #1
    1. The problem statement, all variables and given/known data
    If electric flux density (D) is given by the vector (xy,yz,xz) then calculate the displacement current density

    2. Relevant equations
    Jd = dD/dt

    3. The attempt at a solution
    if you differentiate D, in terms of t, then you just get 0..but that apparently isn't the answer
  2. jcsd
  3. Oct 16, 2013 #2
    If you are getting a "0" as differentiation of electric flux density that means that electric flux density is not changing with time,which means it is electrostatic and not time varying field. You can see this from an example, by keeping D.C voltage across capacitor the current in circuit becomes zero eventually this is because voltage is constant or of zero frequency. So if you don't have a time varying electric flux density there won't be displacement current.
  4. Oct 16, 2013 #3
    This is what i think!
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