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Lines of force around a permanent magnet visualize the magnetic field. A magnetic field is the region where magnetic forces can act on moving charges or magnetic materials, and the field lines show the direction of that influence—typically going from the magnet’s north pole to its south pole. The density of these lines reflects the field’s strength. Magnetic poles are merely the ends of the magnet, not the field itself. Magnetic flux is a measure of how much field passes through a surface, not the field depicted by the lines. Electromagnetic fields involve time-varying electric fields as well; a static magnet mainly produces a magnetic field, which is why this term is the best fit. In MRI, the strong, essentially static magnetic field is this magnetic field.