I am out of my depth here so I am looking for a simple explanation. If you have twisted pair cables of differing makeup, varying in conductive material, diameter of the conductor, number of twists per meter and number of pairs in the cable. What if any effect the pairs capacitance.
This is in the sphere of telecoms.
C = (EoErA)/d
capacitance seems to be based on “Permittivity” which is a function of conductivity which would imply that it will differ by from copper to aluminium.
also the area of the conductor, so that conductors with a larger surface area have more capacitance.
and lastly the insulator and distance between the conductors will play a role.
Are there any effects that I am missing? does the number of pairs around the one tested make any difference?
EDIT: I seem to have misunderstood Permittivity it seems to be only to do with the insulator not the conductor.