noun
magnetic field line; line of magnetic force
Physics term for an imaginary line representing the direction and strength of a magnetic field. Used in contexts like electromagnetism and geophysics.
磁力線はN極からS極へ向かう。
Magnetic field lines run from the north pole to the south pole.
この図は磁石の周りの磁力線を示している。
This diagram shows the magnetic field lines around a magnet.
磁束 (magnetic flux) is a measure of the total magnetic field passing through a given area, whereas 磁力線 are the conceptual lines representing the field.
Compound of 磁力 (magnetic force) + 線 (line). A straightforward technical term.