JEE Main · PhysicsHard
A disc of radius is rotating with angular velocity about its central axis. A second identical disc is placed gently on the first. The final angular velocity of the system is
- A.
- B.
- C.
- D.
Show correct answer & step-by-step solution
Correct answer: A —
Solution
By conservation of angular momentum, . Since , we have , which implies .
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