Need help with gauss law and charged ring AP Physics FRQ

  • #1
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Homework Statement


1.
a14d1y.jpg

2.
2hmox8x.jpg


Homework Equations


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

The Attempt at a Solution



these types of problems i suck at, i dont 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 dont really teach anything
 

Answers and Replies

  • #2
rude man
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, 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.
 

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