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NEET UG PHYSICS MCQ: SYSTEM OF PARTICLES
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A thin uniform disc of mass and radius is rotating in a horizontal plane about an axis passing through its centre and perpendicular to its plane with angular velocity . Another disc of same dimension but mass is placed gently on the first disc co-axially. The angular velocity of the system now is
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Correct option: D
Option D () is correct because the angular momentum is conserved when the second disc is placed on the first, leading to a decrease in angular velocity.
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