Four equal charges of value +Q are placed at any four vertices of a regular hexagon of side 'a'. By suitably choosing the vertices, what can be the maximum possible magnitude of electric field at the centre of the hexagon?
(A) Q4πε0a2
(B) √2Q4πε0a2
(C) √3Q4πε0a2
(D) 2Q4πε0a2
Ans(C)