Three thin, uniform, indentical rods each or mass `M` and length `L` are joined as shown. Find the `M.I.` about an axis passing through `O` and perpendicular to the plane.

Explanation

We know, for rod, `M.I.` of rod about an axis passing through an end and `bot^(ar)` to length is `ML^(2)//3`. Apply this formula directly.

`I_(0)=I_(1)+I_(2)+I_(3)=(ML^(2))/(3)xx3=ML^(2)`