- #1
shehry1
- 44
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Homework Statement
Jackson 6.4b
Homework Equations
Multipole expansion especially Eq 4.9 in Jackson which is for a Quadrupole
The Attempt at a Solution
I found the result in 6.4a. The rho over there tells us that there is a charge density inside the sphere. Since the charge density is uniform about the x,y and z axis hence the dipole part of the expansion will go to zero.
Now for the quadrupole Q33: I convert the formula 4.9 to spherical coordinates and integrate the resulting expression:
(3z^2 - r^2 )*r^2 dr * d(Cos theta) * d(phi).
I get 0 because of the Cos thing. I think I need something like 5/3 from the Cosine to make the answer correct.