Answer please
Q.5. Two charges - q each are fixed separated by distance 2d. A third charge q of mass m placed at the mid-point is displaced slightly by x (x << d) perpendicular to the line joining the two fixed charged as shown in Fig. 1.14. Show that q will perform simple harmonic - q oscillation of time period.
$T={\left[\frac{8{\mathrm{\pi }}^3{\mathrm{\epsilon }}_0{\mathrm{md}}^3}{q^2}\right]}^{1/2}$