Can you please answer the following question?

Consider the charges q,q and -q placed at the vertices of an equilateral triangle. What is the force on each charge?

I actually didn’t understand the total force on charge -q at the vertex C of the equilateral triangle. How is it equal to root3Fn where n is the unit vector along the direction bisecting the angle BCA (Why?).

Thejaswini posted the question

Answer.