A reasonning question (1 Viewer)

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Hi ,
i have a question I dont know how to answer:

Explain why the potential integral formula cannot be used to directly determine the potential from an infinite uniform line charge ρlo that is on the z axis.

When we talk about it in class, I learn that the potential integral was used for finite displacement. I d read the textbook but I did not have other information.

So I there other reason to answer this question?

B.
 

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