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**1. Homework Statement**

This question refers to Griffiths E and M book.

The first equality makes perfect sense to me. It is a standard path-integral along the wire FOR EACH COMPONENT OF THE INTEGRAND. It is defined just like this (for each component)

[tex]\int_C f\, ds = \int_a^b f(\mathbf{r}(t)) |\mathbf{r}'(t)|\, dt[/tex]

I do not understand the second equality at all. What exactly does

[tex]\int \frac{d\mathbf{l'}\times \hat{\mathbf{r}}}{r^2}[/tex]

mean?

I have never seen an integral like. What is the formal definition of that integral? So, you parametrize your path and then do what? I just don't understand!?!?!

BTW: how do you get that the script r that Griffiths uses in latex?

**2. Homework Equations**

**3. The Attempt at a Solution**

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