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## Homework Statement

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?

## Homework Equations

Not sure what to use... ?

E=F/q'

or

F=q'E

## The Attempt at a Solution

I did not know where to start..

Thank you.

Thanks again to anyone who replies. It is late here so I am signing off.. I will reply tomorrow if anyone has responded.

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