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posted by  Arcanum on 5/9/2008 10:27:22 PM  |  status: Closed  

Determining magnitude of electric field:

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This question, I didn't get either, just because I was trying to solve for magnitude, but in reality I solved for something that doesn't even exist. Anyways, the answer to this question is suppose to 0.62 kN/C, which I tried to work backwards and such, but had no luck in getting it correctly, or atleast to have the variables line up.
The question is...
 
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Charge of a uniform density (8.0 nC/m^2) is distributed over the entire xy plane. A charge of uniform density (3.0 nC/m^2) is distributed over the parallel plane defined by z = 2.0m. Determine the magnitude of th electric field for any point with z = 3.0 m.
 
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Thanks for any help given, this question is a little tougher, I assume its a few steps in solving, just don't know where to go. Thanks for the help :+)
Pffhh, if I knew everything, I would spend my entire time on here answering questions, but until then ill spend my entire time on here asking questions... :+)
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posted by richmondMike on 5/10/2008 4:18:26 AM  |  status: Live
Asker's Rating: Lifesaver   
Arcanum's comment:
"Wow, thats is very impressive, thank you so much for putting in all the details, thats a lot of work, I wish I could give you more than 10 points. Thank you again for the help and sorry about the late rate :+)"
Response Details:
For the xy plane, the charge density is
The field of the xy infinite sheet of charge on any point (such as a point with z = 3.0 m) is .
.
(The equation is derived by establishing a cylindrical Gaussian surface with cross-sectional area A, and thus Qencl = σA.
Since, we get .)
For the parallel plane defined by z = 2.0m, the charge density is
The field of the infinite sheet of charge on any point (such as a point with z = 3.0 m) is
The magnitude of th electric field for any point with z = 3.0 m is
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