Energy is stored as a result of the work required to charge a thin, sphere-shaped shell. It is known as self-energy to store energy. The gravitational pull inside the shell is null. This is due to the absence of mass inside, which leaves no gravitational field and no mass.
The following formula can be used to define the moment of inertia of a hollow cylinder with an axis passing through its center with internal and external radii of r1 and r2, respectively, and a mass of M. I = ½ M (r22 + r12). There is no chance the hollow sphere will have the same mass as the solid one even if they are constructed of the same material with the same density (less volume).
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