A thin, insulating rod of length I carries a linear charge density 2(x) that varies with distance according to 2(x)=Ax (in SI units). The location of the origin is shown in the figure. A point charge...

I just need a nudge in the right direction to get started with this question

Extracted text: A thin, insulating rod of length I carries a linear charge density 2(x) that varies with distance according to 2(x)=Ax (in SI units). The location of the origin is shown in the figure. A point charge q is located a distance / from the end of the rod as shown. a. What are the SI units of the constant A? Find the force that the line charge exerts on q.