Magnetic field around straight wire

[Primarygun]

When there are two current-carrying wires are put together facing the same direction on the same plane going through a paper perpendicularly, what will be the magnetic field observed on the paper?

[swansont]

When there are two current-carrying wires are put together facing the same direction on the same plane going through a paper perpendicularly, what will be the magnetic field observed on the paper?

 

The sum of the individual fields, which are given by the right-hand rule (clockwise, for current into the page) and varying as 1/r.

[Primarygun]

I only knows field lines come from north pole to south pole.

For a straight current carrying wire, there's no pole there, so I am not able to figure it out, may you elaborate more?

[swansont]

I only knows field lines come from north pole to south pole.

For a straight current carrying wire' date=' there's no pole there, so I am not able to figure it out, may you elaborate more?[/quote']

 

A current-carrying wire has a field in cylindrical symmetry around it, with the field direction using the convention I described before. here's a picture

[Primarygun]

Thanks