A small iron ball of mass m is suspended with the help of a massless rod of length L and is free to oscillate in vertical plane.Its time period of oscillation is Share with your friends Share 1 Adarsh Saini answered this hjj -5 View Full Answer Yogesh answered this time period is same as simple pendulum because the string is massless which is a case of simple pendulum 8 Rohan Khatode answered this time period is same as simple pendulum because the string is massless which is a case of simple pendulum 0 Aisha answered this Does it make difference in horizontal plane.. I mean why vertical plane is specified??? 2 Sakshar answered this Ashia, vertical plane is specified because in the options there is g. AND ans is 2pi root under l/g -2 Shalvi answered this 2piunderroot l/g -3