Two coaxial discs, having moments of inertia 
and 
, are rotating with respective angular velocities 
and 
about their common axis. They are brought in contact with each other and thereafter they rotate with a common angular velocity. If 
and 
are the final and initial total energies, then 
is :
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
D
JEE Main 2019
As no external torque is acting so angular momentum should be conserved 
common angular velocity of the system, when discs are in contact
Put 
and 
We get :
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