Points A, B, and C are at the vertices of an equilateral triangle. A certain positive charge q placed at A produces an electric field of magnitude 145 N/C at C. Suppose a second, identical charge is placed at B. What is the magnitude of the new electric field at C?
Not sure what to use... ?
The Attempt at a Solution
I did not know where to start..
Thanks again to anyone who replies. It is late here so I am signing off.. I will reply tomorrow if anyone has responded.