Three rings, each of mass `m` and radius `r`, are so placed that they touch each other. Find the moment of inertia about the axis as shown in Fig.

Options

A. `3MR^(2)`
B. `(3)/(2)MR^(2)`
C. `5MR^(2)`
D. `(7)/(2)MR^(2)`

Explanation

`I_(AB)=I_(1)+(I_(2)+I_(3))`
`=(1)/(2)MR^(2)+((1)/(2)MR^(2)+MR^(2))xx2`
`=(7)/(2)MR^(2)`