A particle of mass 1mg and charge q is lying at the mid-point of two stationary particles kept at a distance '2m' when each is carrying same charge ‘q’. If the free charged particle is displaced from its equilibrium position through distance 'x'(x<<1m). The particle executes SHM. Its angular frequency of oscillation will be x10 5 rad/s if 
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(6)
Net force on free charged particle 
So, angular frequency 
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