# Capacitance of a metal strip

1. Aug 6, 2010

### eraserxp

Does anyone know how to calculate the capacitance of a metal strip of width 2a and infinitesimal thickness? The length of the metal strip is much larger than its width.

Thanks a lot!

2. Aug 7, 2010

Capacitance like in a capacitor? Well, first i wonder where you store your electric field? Between the strip and xxx? Where are the terminals connected?

3. Aug 7, 2010

### eraserxp

Maybe my question is a little confusing.

Suppose we have a long metal strip which is very thin and we apply a fixed potential on it. How to calculate the potential around the metal strip?

In order to calculate the potential, we must know the surface charge on the metal. From textbook, we know a single metal can also be served as a capacitor and the charge on it is proportional to the potential. I want to know its capacitance, so that I can calculate the potential outside the metal.

4. Aug 7, 2010

### dlgoff

Take a look at this:
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/pplate.html" [Broken]

Last edited by a moderator: May 4, 2017