Hi @ctelkikar Thank you for your kind support.
I have already made the electric field distribution in the volume of the outside cylinder as shown in Fig.1.
However, I would like to build the EF distribution in the inside surface of the outside cylinder depending on frequency (or depending on cylinders length) as shown in Fig.2.
I am just a beginner at this software. So, I don't know whether it is possible to make this contour graph or not.
I could not find the function for this type of graph.
Do you have any idea about this? if yes, please let me know.

Thank you