# Homework Help: Charge Distribution on Metallic Plates

1. Jun 10, 2010

### surajkaul

1. The problem statement, all variables and given/known data
Four identical metallic plates, each of area A, are seprated by a
distance d as showen in the Figure. Plate 2 is given a charge Q. Plates 1 and 4 Both are earthed.

2. Relevant equations
• Charge Distribution i.e. Charge on each Plate and On each Side of the Plate.
• Will the Outer Surface(Earthed Surface) of the Plates 1 and 4 be having Zero Charge on Them.

3. The attempt at a solution
I really Could not figure out as the Earthed Plates are Confusing Me. I have done similar question where the None of the Plates are Earthed. I tried to start on the same Lines, But ended up confusing myself more. So It will be really Great if I get a good Explanation for this.

Cheers.

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Last edited: Jun 10, 2010
2. Jun 10, 2010

### aim1732

The earthed surface has same potential as Earth - zero. Does this help?

3. Jun 10, 2010

### surajkaul

I know that they at Zero Potential But don't know how to put this Fact to Good Use.
Thanks Anyway. :)

4. Jun 10, 2010

### aim1732

You calculate net potential due to all plates at that point and put it equal to zero. This should be related to charges on these plates and hence can give the distribution.