magnetic field around a current carrying wire

Hi all,

Just a beginner's level very simple question:
How to simulate magnetic field around a current carrying straight conductor?
-Should we use a combination of electric currents/electric circuits and magnetic field? In that case no multi physics is defined by the set up.
-If only magnetic field interface is used, then how to define the input current and ground? Single turn and multi turn coil nodes are available in this case but can we use these for straight conductors?

Thanks