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 ____________ $$\times$$ 10⁵ rad/s if q² = 10 C².

The total charge enclosed in an incremental volume of 2 $$\times$$ 10^$$-$$9 m³ located at the origin is ___________ nC, if electric flux density of its field is found as

D = e^$$-$$x sin y $$\widehat i$$ $$-$$ e^$$-$$x cos y $$\widehat j$$ + 2z $$\widehat k$$ C/m²