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Two charges -q each are fixed separated ...

Two charges `-q` each are fixed separated by distance 2d. A third charge q of mass m placed at the mid-point is displaced at the mid-point is placed slightly by `x (xltltd)` perpendicular to the line joining the two fixed charges as shown in Fig. Show that q will perform simple harmonic oscillarion of time period.
`T = [(8pi^(3) in_(0) md^(3))/(q^(2))]^(1//2)`

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