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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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A uniform disc of radius aa and mass mm is rotating freely with angular speed ω\omega in a horizontal plane about a smooth fixed vertical axis through its centre. A particle of mass mm is suddenly attached to the rim of the disc and rotates with it. The new angular speed is
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Correct option: B
ω3\frac{\omega}{3}
Option B (ω3\frac{\omega}{3}) is correct because the angular momentum is conserved when the particle is attached to the disc.

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