A spherical shell is a solid object with a spherical shape, similar to a ball, that is hollow on the inside.
A spherical shell can be charged by rubbing it with a material such as silk or fur, by induction, or by using a charged object to transfer charge to the shell.
When a spherical shell is charged, the charges distribute themselves evenly on the surface of the shell. This is known as the "Faraday's Ice Pail Experiment".
Yes, a spherical shell can hold a charge on its surface. The charge will remain on the surface due to the repulsion of like charges and the shielding effect of the shell's surface.
The amount of charge on a spherical shell does not affect its electric field inside the shell. However, the electric field outside the shell is affected by the total charge on the shell and the distance from the center of the shell.