homework and exercises - Simulate / plot electrostatic field

I have something like this: For given voltage (9 V red wire, 0 V blue wire) I want to simulate electrostatic field.

I already know, for example that in the point (10.5;0) there are 10 V and etc. I want to simulate and plot electrostatic field for future comparison and for my report.

Is there any software for doing that? I like to work with Maple, so if there is any toolboxes, I would be glad to hear about them.

For slightly different position plot looks awful now:

Answer

As I said earlier in my comment, Comsol is pretty useful for these sort of things. I took your problem, and this is the plot that I got. I hope it's useful.