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## Homework Statement

Hey,

I got the current density [itex]\vec{j}=\frac{Q}{4\pi R^2}\delta(r-R)\vec{\omega}\times\vec{r}[/itex] and now I should calculate the vector potential:

\vec{A}(\vec{r})=\frac{1}{4\pi}\int\frac{j(\vec{r})}{|r-r'|}.

## Homework Equations

## The Attempt at a Solution

here my attempt till now:

http://phymat.de/physics.png [Broken]

I'm really not sure how to go on now. Is this right what I wrote there?

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