Vector potential between two parallel wires with opposite currents

[galipop]

Hi All,

I've just looked at an example for calculating the vector potential for a point in the vicinity of a long straight wire.

I've now got to calculate the vector potential for a point between 2 parallel straight wires carrying currents in opposite directions. How does the vector potential differ in this case.

By the way...study biot-savart is giving me a headache :)

 

[galipop]

does anyone want to have a crack at it?

 

[pervect]

I would think you just add them together (with the appropriate sign).