Physics 2 Electric Fields, Circuits, Magnetism

  • #1
Can someone please help me out with this practice test and provide explanations?
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upload_2016-5-6_21-3-24.png
upload_2016-5-6_21-4-14.png
upload_2016-5-6_21-4-47.png
upload_2016-5-6_21-5-14.png
upload_2016-5-6_21-5-33.png
upload_2016-5-6_21-5-52.png
upload_2016-5-6_21-6-6.png
upload_2016-5-6_21-3-24.png
upload_2016-5-6_21-4-14.png
upload_2016-5-6_21-5-33.png
upload_2016-5-6_21-5-52.png
upload_2016-5-6_21-6-6.png
upload_2016-5-6_21-5-14.png
upload_2016-5-6_21-4-47.png

upload_2016-5-6_21-3-24.png


upload_2016-5-6_21-4-14.png


upload_2016-5-6_21-4-47.png

upload_2016-5-6_21-5-14.png

upload_2016-5-6_21-5-33.png

upload_2016-5-6_21-5-52.png

upload_2016-5-6_21-6-6.png
 

Answers and Replies

  • #2
So for number 1 a, when r<R, I take +Ze as q and plug it into the equation E = kq/r2 and get E = kZe/R2. Not sure if that's correct
 
  • #3
Then for number 1 b when r>R, I assume that E is zero since you set a Gaussian surface that encloses the entire thing so you take the enclosed charge which would be zero since it is +Ze and -Ze which cancels. So when you plug that in to solve for E, you would get zero. Please lmk if this is correct.
 
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