Description:
Flash animation: First, the magnet is fixed and the magnetic needle is mobile. Then the magnet moves in a "field" of magnetic needles.
Video:
00:00 Fixed magnet. Movable magnetic needle
02:05 The magnet moves in a "field" of magnetic needles
02:42 Written summary
02:58 Earth's magnetic field
Definition
Bar magnet: a magnet in the form of a bar with magnetic poles at each end.