One solid sphere A and another hollow sphere B are of same mass and same outer radii. Theirmoment of inertia about their diameters are respectively IA and IB such that

Let same mass and same outer radii of solid sphere and hollow sphere are M and R respectively. The moment of inertia of solid sphere A about its diameter IA=25MR2…(i) Similarly, the moment of inertia of hollow sphere (spherical shell) B about its diameterIB=23MR2… (ii)It is clear from Eqns. (i) and (ii), we get IA