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 lt lt 1" m")`. The particle executes SHM. Its angular frequency of oscillation will be __________ `xx10^(5)` rad/s if `q^(2)=10C^(2)`