Potential difference problem (important)

[Tan_Can]

Homework Statement

I really need help with this problem. The question is: Each side of an equilateral triangle measures 3.61cm. A charge of -0.34mC is placed at each vertex. what is the potential difference at the midpoint of the base of the triangle?

Homework Equations

V=kq/r

3. The Attempt at a Solution

 

[kdv]

Homework Statement

I really need help with this problem. The question is: Each side of an equilateral triangle measures 3.61cm. A charge of -0.34mC is placed at each vertex. what is the potential difference at the midpoint of the base of the triangle?

Homework Equations

V=kq/r

3. The Attempt at a Solution

You have to show some work. Where are you stuck? You must calculate the potential of each charge at that point and add the three results.