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**1. The problem statement, all variables and given/known data**

Last week I https://www.physicsforums.com/showthread.php?t=483819" which I believe didn't get answered because my description of the problem was a lot messier than it needs to be. Hopefully today, I will not make the same mistake.

In physics books, when calculating the electric field due to a finite line of charge, the problem is usually setup as shown in the top half of my figure. The point of interest / evaluation is placed on the Y axis, and the two endpoints of the line are placed right on the x axis.

What I would like to know is how to set up my integral to solve for this basic problem, if my line weren't parallel with the X axis. I know I could rotate everything by some angle theta (the angle between the line and the x-axis), do my calculations, then rotate everything back into place. But I would much rather discover the correct way to arrange my integrals to solve for this sort of problem directly, rather than altering the reference frame.

**2. Relevant equations**

Please see attached diagram below.

**3. The attempt at a solution**

[PLAIN]http://authman.net/problem.jpg [Broken]

Thanks in advance for any direction that is bestowed..

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