A thin rod of mass `6 m` and length `6L` is bent into regular hexagon. The `M.I.` of the hexagon about a normal axis to plane and through centre of system is

Options

A. `mL^(2)`
B. `3mL^(2)`
C. `5mL^(2)`
D. `1 1mL^(2)`

Answer

C

Explanation

`I_("rod") = (ml^(2))/(12) + m ((sqrt(3))/2l)^(2) , I_("system") = 6I_("rod")`