Question

What is the electric field at the centroid of an equilateral triangle of side length $r$ , carrying charge $q$ at each corner?

• A. $\sqrt{2} \,Kq\,r^{-2}$
• B. $(1/\sqrt{2} \times Kq\,r^{-2})$
• C. $3\,Kq\,r^{-2}$
• D. zero

Answer 1

Answer: (D)

zero

Answer 2

Three electric fields will be equal in magnitude and opposite in direction. Therefore, electric field at the centre $O$ is zero