Electric Scalar Potential and Electric Field Intensity

[EbenC]

Homework Statement

A uniform line charge of -4π x 8.85 pCm^-1 is situated between the points (-5,0) and (-2,0) m and another such line of positive charge between (2,0) and (5,0) m.

A) Find the electric scalar potential V at (1,0) m.

B) Find the electric field intensity E at the same point.

Homework Equations

(I think, but I'm not sure)
[PLAIN]http://img684.imageshack.us/img684/6707/80046486.png

The Attempt at a Solution

I really don't know where to begin... any help is appreciated.

 

[EbenC]

Can anyone help me

 

[SammyS]

What have you tried?

Where are you stuck?

 

[EbenC]

Well, most importantly, I'm having trouble understanding the question, conceptually. The two lines are horizontal, I'm guessing, stretching from (-5,0) to (-2,0) and (5,0) to (2,0). Is this correct?

Also, it doesn't say what the value of the second line is, it just says "another such line of positive charge," so does this mean they're both the same charge?

 

[SammyS]

"Also, it doesn't say what the value of the second line is, it just says "another such line of positive charge," so does this mean they're both the same charge? "

It means that the linear charge density for the second charge is:$$+4\pi\times8.85\,\text{pC/m}$$