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1. Homework Statement
This may be simple but apparently I can't see it. When given two parallel infinite line charges, how do you change dl to dr? A book I have says that dl*\hat{r}=dr but I don't see how. Any help is greatly appreciated. Thanks!
2. Homework Equations
3. The Attempt at a Solution
1. Homework Statement
2. Homework Equations
3. The Attempt at a Solution
This may be simple but apparently I can't see it. When given two parallel infinite line charges, how do you change dl to dr? A book I have says that dl*\hat{r}=dr but I don't see how. Any help is greatly appreciated. Thanks!
2. Homework Equations
3. The Attempt at a Solution
1. Homework Statement
2. Homework Equations
3. The Attempt at a Solution