Five point charges $\;(q\;each)\;$ are placed at five vertices of a regular hexagon of side 2a . What is the magnitude of net electric field at the centre of hexagon .

Question

$(a)\;\large\frac{kq}{a^2}\qquad(b)\;\large\frac{kq}{4 a^2}\qquad(c)\;\large\frac{kq}{2 a^2}\qquad(d)\;\large\frac{kq}{16 a^2}$