Let \(S\) and \(G\) be positions of centre of mass and geometric centre is a disc attached to a rotating disc with axis at \(O\) as shown Fig.12. Let the system be resisted by viscous damping. Then at the critical speed, the relative positions of \(G\) and \(S\) are given by

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(a) (c) 0 G S Fig.12 (b) (d) S S