- #1
Astrum
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- 5
I'm not sure I get how:[tex]\frac{\mu_{0}}{4\pi}\int_{C}\frac{I(d\vec{l}\times\vec{r})}{r^{3}}[/tex] = [tex]\frac{\mu_{0}}{4\pi}\int_{C}\frac{I(d\vec{l}\times\hat{r})}{r^{2}}[/tex]
the r is a displacement vector in the first, and in the second it's a unit vector, but why is this so?
the r is a displacement vector in the first, and in the second it's a unit vector, but why is this so?
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