Three equal charges each of +q are placed at the three vertices of an equilatoral triangle. If the distance of centroid from each vertex of the triangle is r, then the electric field at the centroid will be

Options

A. (1)/(4 pi epsilon_(o)) 3q/r^(2)
B. (1)/(4 pi epsilon_(o)) 3q/r
C. (1)/(4 pi epsilon_(o)) q/r^(2)
D. zero

Answer

D