ABCDEF is a regular hexagon of side a. At each vertex A,B and C a point charge +q is fixed and D,E,F a point charge –q is fixed. Intensity of electric field at a point lying on the line joining FC at a distance x away from the centre of hexagon $(x>>>>a)$ is found to be $\frac{\sqrt{\alpha }aq}{2\pi {\epsilon }_0{x}^3}$ , where $\alpha$ is an integer. Find  $\alpha$