Two spherical shells with radii 
and 
respectively
concentrically surround a point charge. The central point charge has
magnitude 
. Both the spherical shells have a charge of 
(each)
distributed uniformly upon the shells.
Find the field and potential at all points in space. Show your work -
even if you can just write the answer(s) down for each region, briefly
sketch the methodology used to get the answers.