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The total force on charge q on the vertex

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.

An equilateral triangle. {3/1}
An equilateral triangle. {3/1} (Photo credit: Wikipedia)

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