radius R are joined to the ends of a weightless rod of length 2R. The M.I. of the system about the perpendicular axis through its centre will be

Options

A. None
B. `2MR^(2)`
C. `5/2 MR^(2)`
D. `3MR^(2)`

Answer

C

Explanation

`I=2 [I_(CM) +MR^(2)]`
`=2[(MR^(2))/(4) +MR^(2)] =2xx (5MR ^(2))/(4)=(5MG^(2))/(2)`