Electrostatic model -AC/DC module

Hello everyone

I have to solve electrostatics (divergence V = Electric field ) for a simple model (attached-My Model.PNG). I have to apply AC voltage between the 2 electrodes shown in the diagram.

Could someone please guide me how can i do that? Also, will it be possible to show electric field lines(shown in another attached file-Field lines.PNG ) and isopotential lines after i get the solution to my model? This is very important for my study.

Thanks a lot!

Best regards
Zaid