[" c) "sqrt((1)/(7)R)" d) "R],[" If "l_(1)" is the moment of inertia of a thin rod "],[" about an axis perpendicular to its length and "],[" passing through its centre of mass and "l_(2)" is "],[" the moment of inertia of the ring about an "],[" axis perpendicular to plane of ring and "],[" passing through its centre formed by "],[" bending the rod,then "],[[" a) "(l_(1))/(l_(2))=(3)/(pi^(2))," b) "(l_(1))/(l_(2))=(2)/(pi^(2))],[" c) "(l_(1))/(l_(2))=(pi^(2))/(2)," d) "(l_(1))/(l_(2))=(pi^(2))/(3)]]