Gauss's law for a charged ring in AP Physics

[lodovico]

Homework Statement

1.

2.

Homework Equations

∫E.dA = Qenc/$\epsilon$$_{o}$
$\lambda$=Q/L
$\rho$=Q/V
V= q/4πε$_{o}$r

The Attempt at a Solution

these types of problems i suck at, i don't know how to do these at all independently, and is there any difference in question 2 if there is an insulator or not? is that irrelevant?

I have the scoring guidelines with the answers but they don't really teach anything

 

[rude man]

, and is there any difference in question 2 if there is an insulator or not? is that irrelevant?

This is a simple exercise in applying Gauss's theorem.

To answer your question, yes it matters if the inside sphere is an insulator or a conductor. It matters for r < R.