A uniform disc of radius R is put over another uniform disc of radius 2R of same thickness and density. The peripheries of the two discs touch each other. The position of their centre of mass is
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a
at R/3 from the centre of the bigger disc towards the centre of the smaller disc
b
at R/5 from the centre of the bigger disc towards the centre of the smaller disc
c
at 2R/5 from the centre of the bigger disc towards the centre of the smaller disc
d
none of the above
answer is B.
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Detailed Solution
for uniform disc, distance from centre of bigger disc is