Please check out [url=]JaCoB[/url].
Click [b]Electricity[/b] at the right frame, then click [b]Two cylinders[/b].
May be it is what you want. There are a lots of possibility with JaCoB.
The following is a demo. You can also check out [url=]Image charge: point cgarge and a sphere[/url]


The following is a JaCoB applet.?Move your mouse inside  and [b]right click[/b] for menu to generate objects, charges ...etc.

Check out attached image!

Download and open Jacob.htm with your browser.