Two identical positive charges Q each, are placed on the x axis at points (−a,0) and (a,0). A point charge of magnitude q is placed at the origin. For small displacement along x axis, the charge q executes simple harmonic motion if it is positive and its time period is T1. If the charge q is negative, it performs oscillations when displaced along y axis. In this case the time period of small oscillations is T2. Find T2T1.