Two rods each of mass m and length l are joined at the centre form a cross. The moment of inertia of this cross about an axis passing through the common centre of the rods and perpendicular to the plane formed by them, is

Q: Two rods each of mass m and length l are joined at the centre form a cross. The moment of inertia of this cross about an axis passing through the common centre of the rods and perpendicular to the plane formed by them, is

(a) $\frac{m l^2}{12}$

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

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

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

Ans: (c)