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My professor said this problem is straightforward in spherical coordinates,
[tex] \int_{|\vec{r_1}|\leq a } \int_{|\vec{r_2}|\leq a } \frac{1}{|\vec{r_1}-\vec{r_2}|} d^3 r_2d^3r_1[/tex]
i set up the integral in spherical coordinate and found it really ugly...
[tex] \int_{|\vec{r_1}|\leq a } \int_{|\vec{r_2}|\leq a } \frac{1}{|\vec{r_1}-\vec{r_2}|} d^3 r_2d^3r_1[/tex]
i set up the integral in spherical coordinate and found it really ugly...