I seem to remember that capacitance can be created between 2 wires running parallel to each other having different emf. this will reuslt in loss of energy in the wires. I am still recuperating so dont have access to my books in transmission line theory but I hope this following links help.
http://www.allaboutcircuits.com/vol_2/chpt_13/3.html http://www.opamp-electronics.com/tut...ce_2_14_03.htm