magnetic field

noun3

1. •
   A condition in the space around a magnet or electric current in which there is a detectable magnetic force and two magnetic poles are present.

   • David (1904) and Brunhes (1906) first observed magnetizations in lava flows that were roughly opposed to that of the present earth's magnetic field. — 1983
2. •
   B-field.
3. •
   (old-fashioned) H-field.