One solid sphere A and another hollow sphere B are of same mass and same outer radii. Their moment of inertia about their diameters are respectively Ι A and Ι B such that :
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Let same mass and same outer radii of solid sphere and hollow sphere are M and R respectively.
The moment the moment of inertia of hollow sphere (spherical shell) B about its diameter
Ι A = 
MR 2 ...................(i)
Similarly the moment of inertia of hollow sphere (spherical shell) B about its diameter
Ι B = 
MR 2 ...................(ii)
Ι t is clear from eqs. (i) and (ii) , Ι A < Ι B
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