(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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. Relevant equations

3. The attempt at a solution

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Griffiths equation 5.32

**Physics Forums | Science Articles, Homework Help, Discussion**