# Uniform Charge Denisty

1. Apr 12, 2007

### sister007

1. The problem statement, all variables and given/known data

ou've hung two very large sheets of plastic facing each other with distance d between them, as shown in the figure View Figure . By rubbing them with wool and silk, you've managed to give one sheet a uniform surface charge density eta_1= - \eta _{0} and the other a uniform surface charge density eta_2= + 3 \eta _{0} . What is the electric field strength at
POINT 1 (TO THE LEFT OF THE NEGATIVE PLATE)
POINT 2 (BETWEEN THE PLATES)
POINT 3 (TO THE RIGHT OF THE POSITIVE PLATE)

Specific distances are not given, all the the distances ("radius's") from the plates are the same.

2. Relevant equations

I was under the impression that only parrallel plate capacitors have uniform charge. So indeed all the charges will be different.
Would the point 1 be Net charge=o? Or would it be 1(nu)-3(nu)=-2nu?

3. The attempt at a solution

Im my book it says Efield of plane= N/(2xEpsilon) Using that info, I said point 2 is equal to 3/2 (n/E). I was wrong, SO obviously I dont know what I am doing. Help. :yuck:

2. Apr 13, 2007

### Mentz114

There's no figure.

3. Apr 14, 2007

-1-(+3)=-4.