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 as axis through centre O and perpendicular to its plane is

Q: 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 as axis through centre O and perpendicular to its plane is

(a) $\frac{4}{3} m l^2$

(b) $\frac{1}{3} m l^2$

(c) $\frac{1}{6} m l^2$

(d) $\frac{2}{3} m l^2$

Ans: (a)