Two semicircular rings of linear mass density λ and 2λ and of radius R are joined to form a complete ring. The distance of the center of mass of the complete ring from its centre is

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3R8π

2R3π

4R21π

None of these

answer is B.

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Detailed Solution

C12Rπ,0C2−2Rπ,0X – Co-ordinate of COM of the system =m−2R/π+2m2R/π3m=2R3π

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