Four thin rods of same mass M and same length l, form a square as shown in figure. Moment of inertia of this system about an axis through centre O and perpendicular to its plane is

Explanation

From parallel axes theorem,
`I =4I_(CM) + 4M(L/2)^2 = 4 ((ML^2)/12)+ 4 (ML^2)/4 = 4/3 ML^2`