These animations show a magnet approaching a conducting coil, then getting farther. The magnetic field lines caused by the magnet change color when they get through the coil. The inducted current in the coil is represented by red spheres in motion (they move in the direction of conventional current).
Other animations by Yves Pelletier
The title says it all: this blog features physics videos found everywhere on the web: animations, demonstrations, lectures, documentaries.