MadSci Network: Physics

Subject: Why does the Electrical Field Strength differ between sheets and surfaces

Date: Thu Feb 17 18:33:01 2005
Posted by Thomas
Grade level: 10-12 School: Richard Montgomery High School
City: Rockville State/Province: Maryland Country: USA
Area of science: Physics
ID: 1108686781.Ph

I am studying Gauss's law in my physics class. There are a few concepts that 
arise out it that I need help understanding.

Using the derivation method provided by his formula, we get different electric 
field formulas for the a charged sheet and a charged wall, as I have shown 

    Sheet of Charge, where the E field comes out of both sides of the sheet
              E = (Charge Density/Area)/(2*Permitivitty Constant)

   Wall Surface, where the E field comes out of only the surface that has the  
charge aligned all across it
              E = (Charge Density per Area)/(Permitivvity Constant)

Now, I know that the reason that the 2 exists in the sheet formula is because 
the electric field passes out of two surfaces, front and back. But is there a 
scientific reason as to why an electric field would decrease by half if it 
passes out two surfaces? (I am assuming that if the charge density was the 
same for both a sheet and a wall, the electric field strength out of one side 
of the sheet would still only be half-strength of the electric field coming 
out of the charged wall.) 

Re: Why does the Electrical Field Strength differ between sheets and surfaces

Current Queue | Current Queue for Physics | Physics archives

Try the links in the MadSci Library for more information on Physics.

MadSci Home | Information | Search | Random Knowledge Generator | MadSci Archives | Mad Library | MAD Labs | MAD FAQs | Ask a ? | Join Us! | Help Support MadSci

MadSci Network,
© 1995-2005. All rights reserved.