[" Three equal negative charges,"-q_(1)" each,from the vertices of an equilateral triangle.A particle of "],[" mass "m" and a positive charge "q_(2)" is constrained to move along a line perpendicular to the plane of triangle "],[" and through its centre which is at adistancer from each of the negative charges as shown in the figure."],[" The whole system is kept in gravity free space.Find the time period of vibration of the particle for small "],[" displacement from equilibrium position."],[qquad (1)/(4),(1)/(2)],[" (2) Options "],[3 pi sqrt((4 pi varepsilon_(0)mr)/(3q_(0)m_(2)))]