A particle of mass 1 mg and charge q is lying at the mid-point of two stationary particles kept at a distance ‘2 m’ when each is carrying same charge ‘q’. If the free charged particle is displaced from its equilibrium position through distance ‘x’ (x ≪ 1 m). The particle executes SHM. Its angular frequency of oscillation will be _____ $\times 10^5 \mathrm{rad} / \mathrm{s}$ if $\mathrm{q}^2=10 \mathrm{C}^2$.