A uniform disc of radius R is put over another uniform disc of radius 2R of same thickness and density. The peripheres of the two discs touch eachother. The position of their centre of mass is

Options

A. at `(R )/(3)` from the centre of the bigger disc towards the centre of the smaller disc
B. at `(R )/(3)` from the centre of the bigger 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

B