A point charge q = +2.6 µC is placed at each corner of an equilateral triangle with sides 0.13 m in length.
What is the magnitude of the electric field at the midpoint of any of the three sides of the triangle?
The Attempt at a Solution
I first tried using the first equation, but I was pretty sure that I had to also use the other three equations, but I did not know how to properly solve for each of the F values. Am I supposed to use F=(kq1 q2)/r^2 ?