A disc of mass .m. and radius R has a concentric hole of radius .r.. Its M.I. about an axis through centre and normal to its plane is

Options

A. `(m)/(2)(R-r)^(2)`
B. `(m)/(2)(R^(2)-r^(2))`
C. `(m)/(2)(R+r)^(2)`
D. `(m)/(2)(R^(2)+r^(2))`

Answer

D