A solid insulating sphere of radius 5.0 cm shown in blue has a uniform charge density
throughout its volume. Concentric with this sphere is a conducting thick hollow spherical shell
of inner radius 20.0 cm and outer radius 25.0 cm shown in grey.
The electric field at a point 10 cm from the center is measured to be 3600 N/C directed radially
inward and the electric field at a point 50 cm from the center is measured to be 200 N/C
directed radially outward. Using this information, find:
a. The charge on the insulating sphere
b. The net charge on the hollow conducting spherical shell
c. The charge on the inner surface of the hollow conducting spherical shell
d. The charge on the outer surface of the hollow conducting spherical shell
The Attempt at a Solution
So I know that you have to use Gauss's law and probably flux as well.
So this is what I tried to do:
a) q= 3600(0.02)^2 / (8.998x10^9)= 1.6x10^-10 C
b) E=0 because it is the conductor
and now i'm stuck since I am second guessing myself
Help would be great.