The moment of inertia of a thin square plate of mass `1.2 kg ` is `0.2 kg m^(2)` when its is made to rotate about an axis perpendicular to plane of plate and through a corner of plate. The side length of plate is

Options

A. `0.2 m`
B. `0.4m`
C. `0.5 m`
D. `0.8m`

Answer

C

Explanation

`I=(MR^(2))/6+M(L/(sqrt(2)))^(2)=0.2`