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Monopole,dipole,quadropole moment

  1. May 2, 2009 #1
    a point charge +Q is placed at the origin and a charge -Q is smeared around the origin maintaining cylindrical symmetry around the Z axis.Show that (i) when the charge distribution is prolate(egg-shaped),the monopole and dipole moments are zero but the quadrupole moment Q is positive; (ii) when the charge distribution is oblate(pizza-shaped),the monopole and dipole moments are again zero but the quadrupole moment is negative. please help me solving this problem ....
     
  2. jcsd
  3. May 2, 2009 #2

    diazona

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    Well what have you tried so far?
     
  4. May 2, 2009 #3
    by the quadropole relation what we know, i can say about the +ve and -ve sign of Q ... but i cannot understand about monopole & dipole term- how they are goinh to zero ...
     
  5. May 2, 2009 #4

    diazona

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    Start with the formulas for the monopole "moment" (i.e. charge) and dipole moment. Do you know those?
     
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