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Homework Help: Distorted orbital shell when E-field applied (Dielectrics)

  1. Mar 22, 2010 #1
    1. The problem statement, all variables and given/known data
    Єr = 3.0, atomic density = 1028 atoms/m3. The mag. of the E-field is 10,000 [V/m]. Two electrons in outer orbital shell will distort with an applied E-field. If both both electrons follow some orbital path as a pair, find spacing between center of nucleus and average location of electrons.

    2. Relevant equations
    Єr = 1 + Χe
    Є = Єor
    P = Єoe*E

    3. The attempt at a solution
    If I solve for the magnitude of polarization, I come up with mag(P) = Єoe*mag(E). If so, I receive mag(P) = 1.771e-7 [V/m]. If need be, the magnitude of the electric flux density is: mag(D) = Є*mag(E) = 2.66e-7 [C/m2]. What is really throwing me off is the atomic density! I have no idea how to incorporate this it does not seem applicable with any of the formulas in my text. I am kind of confused by this problem, in general. I do not know how to get past my attempt above at working some of the variables.

    I appreciate any help you may be able to give me, and I thank you sincerely in advance!
  2. jcsd
  3. Mar 22, 2010 #2
    Electric polarization P is dipole moment per unit volume. You need to solve for the individual dipole moments. So you need to convert this "dipole moment per unit volume" to individual dipoles knowing the atomic density.
  4. Mar 23, 2010 #3
    and then from there, I set the magnitude of P equal to Q*mag(d), where Q is equal to the charge of an electron. Is this correct?
  5. Mar 23, 2010 #4
    First find the dipole per atom before you start plugging in charges and distance.
  6. Mar 23, 2010 #5
    Alrighty, thank you much!
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