1. The problem statement, all variables and given/known data Is the magnetic field around a point in a current-carrying wire radially outward (spherically) like the electric field? Or is it a bunch of concentric circles extending in one plane? I've always thought of it as a bunch of concentric loops in the same plane, however... After I learned Biot-Savart's law, which is: I wasn't so sure anymore. Why? see diagram My Question: If the magnetic field around a segment of wire, ds, is a bunch of concentric loops extending in one plane (YZ plane), HOW can point P, which is OUTSIDE of the magnetic field's plane at that point (it's in the XY plane), experience the magnetic field due to a segment far away? Also, how can a segment far away generate a magnetic field at P, like in case 2, where P is not directly above a current-carrying wire?