A small charged sphere of radius a=1.10 cm is suspended by a nylon thread inside a larger neutral, conducting sphere. The larger sphere has an interior radius b=4.70 cm and is 0.5 cm thick. The charge on the small sphere is q=0.90 nC. The two spheres are concentric and insulated from their surroundings. For the following questions, the origin of our coordinates is the center of the spheres.
Since the conducting sphere is neutral, the total charge in the system is the same q as on the inner sphere, and it will determine the electric field on the outside.
This electric field E on the outside can be found from the ...
140+ words of explained calculation to help calculation the magnitude of electric potential at the outside of a sphere.