Dear Prof Hwang At last I managed to see the applet....our systems are slow and one of the Java plugins was not available....Thanks. I will modify the doc file that I had sent to you via mail....based on the applet. There will not be any field between the plates initially at t = 0+. I will also add a couple of points reg emf source operation like battery so that the role of the source is clear to the students. "The important thing to understand is that electrons are motivated to and/or from the cell's electrodes via ionic reactions between the electrode molecules and the electrolyte molecules. " from I will add some points regarding the potential changes from the problems at especially question No. 9 in the above site. If there are any suggestions you can make on the electric field E2 I will be happy to include it, else I will delete it. Regards Sridhar