Let the radii of the thin spherical and the solid sphere are R1 and R2 respectively Then the moment of inertia of the spherical shell about their diameter I=
2
3
MR12 ....(i) and the moment of inertia of the solid sphere is given by I=
2
3
MR22 ....(ii) Given that the masses and moment of inertia for both the bodies are equal, then from Eqs. (i)and (ii)