The spherical shell of radius R1 carries a uniform surface charge density s1 > 0. The second, larger spherical shell of radius R2 which is concentric with the first carries the uniform surface charge density s2.
(a) Utilize Gauss' law to find out the electric field in the regions r < R1, R1 < r < R2, and r > R2.
(b) Find out the ratio s2/s1 which gives E?? = 0 for r > R2.
(c) Draw the electric field lines for the case in part (b) for s1 > 0