Electric Fields due to a charged disk.

AI Thread Summary
The discussion centers on the comparison of electric field magnitudes Ea and Eb due to a charged disk. The original question challenges the assertion that Ea is greater than Eb, as calculations suggest a larger radius results in a higher value for Eb. Participants agree that the provided solution seems incorrect and recommend consulting a teacher for clarification. Additionally, there is speculation about the magnitude of Ec, with the belief that it should fall between Ea and Eb. Overall, the consensus indicates confusion over the relationships between the electric fields and a need for further explanation.
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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
[PLAIN]http://img94.imageshack.us/img94/1187/ch22q9part1.png

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 doesn't make sense!

The Attempt at a Solution



I plugged in numbers, and a bigger radius gives a bigger number for Eb, so shouldn't Eb > Ea?
 
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You're right, those don't make sense. Talk to your teacher.
 
chronos98 said:
You're right, those don't make sense. Talk to your teacher.

Any ideas as to where Ec would lie in magnitude?
 
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.
 
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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