Does in charging the mass of a body change?

Does mass of a body change on charging?

Does the centre of mass of a body necessarily be inside the body ?

Does centre of mass of a body actually exist in reality? Does centre of mass of a solid body lie necessarily Inside it ?

Does moment of inertia of a body change with the change of the axis of rotation?

Give the location of the centre of mass of a :- cube, each of uniform mass density. Does the centre of mass of a body necessarily lie inside the body ?

Is the mass of a body affected on charging?