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Electric Fields due to a charged disk.

  • Thread starter help1
  • Start date
  • #1
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Homework Statement



Why is this answer saying that Ea > Eb?


Homework Equations



Everything pertinent to this question is located in this picture:

http://img94.imageshack.us/img94/1187/ch22q9part1.png [Broken]
[PLAIN]http://img94.imageshack.us/img94/1187/ch22q9part1.png [Broken]

The question is asking which has the greater magnitude Ea or Eb, and this website says Ea > Eb, just like the solution manual, but that doesnt make sense!

The Attempt at a Solution



I plugged in numbers, and a bigger radius gives a bigger number for Eb, so shouldnt Eb > Ea?
 
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Answers and Replies

  • #2
14
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You're right, those don't make sense. Talk to your teacher.
 
  • #3
4
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You're right, those don't make sense. Talk to your teacher.
Any ideas as to where Ec would lie in magnitude?
 
  • #4
14
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I'm pretty sure it would be the difference of the two, if c is a donut ring like I think it is. I'll let you figure out how that would compare.
 
  • #5
4
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Seems to me as though the order should be Eb > Ea > Ec instead of Ea > Eb > Ec, as suggested by the text.
 

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