The moment of inertia of a ring about an...

The moment of inertia of a ring about an axis passing though the centre and perpendicular to its plane is l. It is rotating ring is gently placed `omega` Another identical ring is gently placed on it, so that their centres coincide. If both the rings are rotating about the same axis, then loss in kinetic energy is

`(Iomega^2)/2`

`(Iomega^2)/4`

`(Iomega^2)/6`

`(Iomega^2)/8`

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