chapter  4
13 Pages

Magnetism

Figure 4.1 A typical fl ux pattern around a bar magnet. The arrows indicate the direction that a compass needle would point to at that position in the fi eld

These forces exist and can be detected without any physical contact between the magnet and the iron fi lings. The general name for a force of such a type is a fi eld force. The fl ux pattern, therefore, is a map of the magnetic fi eld of the magnet, and it indicates the direction and strength of this fi eld.