# Homework Help: Find the electric potential

1. Feb 12, 2010

### Arshad_Physic

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

A wire that has a uniform linear charge density of 2.2 μC/m is bent into the shape as
shown below, with radius 3.7 m.

The Coulomb constant is 8.98755 × 109 N · m2/C2. Find the electrical potential at point p.

Here is the image:
http://s769.photobucket.com/albums/xx339… [Broken]

(Radius is 3.7 and the distance of line is 7.4)
Answer in units of V.

2. Relevant equations

V = - integral (E dl)

3. The attempt at a solution

I am at a total loss as to how to solve this. First I thought that since the density is uniform, we won't have to integrate. But I am guessing that integration will be done on this one first for the line and then for the circle. But I am totally stuck as to what to integrate, and what will be the limits of integration.

On this one I spent about 1 hour, but I have reached to no conclusion. I need help on this one! :)

PLEASE HELP!!! :)

Thanks!

Last edited by a moderator: May 4, 2017
2. Feb 12, 2010

### Arshad_Physic

okay - time is up now - now I can see the solution..........

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