An object comprises of a uniform ring of...

An object comprises of a uniform ring of radius `R` and its uniform chord `AB` (not necessarily made of the same material) as shown. Which of the following can not be the centre of mass of object

`(R//3,R//3)`

`(R//2,R//sqrt(2))`

`(R//4,R//4)`

None of these

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The correct Answer is:

Ans. (2)
COM will be about line `y=x`

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