How Does Charge Affect Electric Field in Spherical Shells?

[Hooke's Law]

Homework Statement

What is the electric field if r=a and r=b?
Reference:http://www.youtube.com/watch?v=BcuQ2c_WrMc"

2:11

And what if the net charge is just -Q on the conductor instead of -3Q? Will the electric field at r>b be 0?
Reference: Same video, 3:00-3:10

Homework Equations

Flux = E*A = q/ epsilon0

 

[SammyS]

Hello Hooke's_Law.

Yes, then E=0 for r>b .