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A circular disc of radius R is removed f...

A circular disc of radius R is removed from a bigger circular dise of radius 2 R from one edge of the disc as shown in Fig. The centre of mass of the new disc is `alpha R`from the centre of the bigger disc. Find the value of `alpha`.

A

`1/2`

B

`1/3`

C

`1/4`

D

`1/6`

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