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A uniform disc of radius 'a' and mass 'm...

A uniform disc of radius 'a' and mass 'm' is rotating freely with angular speed `omega` in a horizontal plane about a smooth fixed vertical axis through its centre. A particle of mass 'm' is then suddenly attached to the rim of the disc and rotates with it. The new angular speed is

A

`omega//sqrt3`

B

`omega//3`

C

`omega//sqrt4`

D

`omega//5`

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The correct Answer is:
B
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