Q .     A circular disc of radius `R` is removed from a bigger circular disc of radius `2R` such that the circumferences of the discs coincide. The centre of mass of the new disc is `alphaR` from the centre of the bigger disc. The value of alpha is

JEE 2007
A

`1/3`

B

`1/2`

C

`1/6`

D

`1/4`

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