The moment of inertia of a ring about an axis passing through the centre and perpendicular to its plane is ' 
'. It is rotating with angular velocity ' 
'. 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
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
B
From conservation of angular momentum
and 
New 
Change in 
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