# vague concept on potential

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• Mar 5th 2007, 06:45 PM
braddy
vague concept on potential
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 read the textbook but I did not have other information.

So I there other reason to answer this question? This concept of infinity is a little vague for me.
B.
• Mar 5th 2007, 10:22 PM
topsquark
Quote:

Originally Posted by braddy
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 read the textbook but I did not have other information.

So I there other reason to answer this question? This concept of infinity is a little vague for me.
B.

I'll answer by asking a question:
Where is the reference point (that is, where is the potential function equal to 0) for this problem?

-Dan
• Mar 5th 2007, 11:11 PM
braddy
Quote:

Originally Posted by topsquark
I'll answer by asking a question:
Where is the reference point (that is, where is the potential function equal to 0) for this problem?

-Dan

The convention says at infinity V=0[V].