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**Never mind, i got it, whew**

## Homework Statement

http://img137.imageshack.us/img137/6250/chargqg0.th.jpg [Broken]

The rod has a nonuniform charge density lambda = ax (a is a positive constant). Find electric potential at point A.

## Homework Equations

V = kq/r

E = kqq/r^2

V = -[tex] \[ \int_a^b E dot dr\] [/tex]

## The Attempt at a Solution

I am pretty close to the answer, I'm just not quite there.

If I'm not mistaken it is something like:

[tex] \[ \int_d^{L+d} kax*r/r^2\,dr [/tex]

but I'm not quite sure what to do with the 'x', from the answer, I know that it has to end up being the integral of 1/r, so x can't be r because it would end up being just the integral of dr

Maybe the limits are incorrect?

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