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Three rings, each of mass m and radius r...

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.

A

`5mr^(2)`

B

`5/7mr^(2)`

C

`7mr^(2)`

D

`7/2mr^(2)`

Text Solution

Verified by Experts

The correct Answer is:
D
`I=I_(1)+I_(2)+I_(3)`
`I_(1)=I_(2) =3/2mr^(2)`

`I_(1)=I_(2)=3/2mr^(2)`
`I=I_(1)+I_(2)+I_(3)=7/2mr^(2)`
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