Spice Simulation of EMI in Long Parallel Wires?
One way to analyze wires is to use NEC (Numerical Electrical Code). There are quite a few frontends for NEC which make life easier, as it requires numerical input, and spews out a lot of numbers.

But it allows you to simulate wires of any shape and position, induce voltages and/or currents, and determine the impedance and voltages.

Have a look at this tutorial, or this nice article in QST in 4 parts (Part 1, part 2, part 3, part 4).