|MadSci Network: Physics|
Please see this recently posted answer to a question similar to yours: sphere
There is NO FIELD inside a sphere or a geodesic type of arrangement. You can't even force there to be a field! However, if you introduced a small electrode somewhere inside the sphere there would be a field surrounding the small electrode, up to the inside surface of the large sphere.
Have I answered your question? If not, please send in another question and clarify what it is we can help you with.
John Link, MadSci Physicist
Try the links in the MadSci Library for more information on Physics.