Consider a system of two equal point charges, each Q=8μC, which are fixed at points (2 m,0) and (−2 m,0). Another charge q is held at a point (0,0.1 m) on the y-axis. Mass of the charge q is 91 mg. At t=0, q is released from rest and it is observed to oscillate along y-axis in a simple harmonic manner. It is also observed that at t=0, the force experienced by it is 9×10−3 N. Frequency of oscillation is
