Copper coils become electromagnetic swings.

The current generated when one copper coil swings through a magnetic field will start a second coil swinging, showing some of the ways that electricity and magnetism interact.

One 1 x 12 inch (2.5 x 30 cm) board, When you start the first coil swinging [...]

Iron filings will trace out the lines of a magnetic field in three dimensions.

Iron filings will line up parallel to a magnetic field, making the pattern of the field visible. This is a simple Snack to build – and because the filings are trapped in a bottle, they don’t make [...]

A magnet falls more slowly through a metallic tube than it does through a nonmetallic tube.

When a magnet is dropped down a metallic tube, the changing magnetic field created by the falling magnet pushes electrons in the metal tube around in circular, eddy-like currents. These eddy currents have their own [...]