Conducting sphere Find the electric filed for r<a,a<r<b,r>b

[Jozefina Gramatikova]

Homework Statement

Homework Equations

The Attempt at a Solution

for part ii)
a<r<b E=0
I am not sure what will be the difference between the formulas for the electric field for a<r and a>b I think the formulas will look the same:

The only difference that I can think of is that when r<a, we are going to use the charge enclosed in that surface. For r>b we are going to use the total charge. Is that true?

 

[Emmo Amaranth]

I'm confused on your use of variables, but looks like you got the right idea. You're correct, Q_enc refers to total charge enclosed within the closed surface you're integrating over.