Eddy Currents: Electromagnetic Induction
Eddy Currents: Electromagnetic Induction
Purpose
To observe the opposing magnetic forces produced by the eddy currents set up
within the walls of an aluminum tube by a magnet falling through the tube.
Description
Side-by-side, a cylindrical magnet and a cylindrical (look-alike)
"dummy" magnet are dropped down two aluminum tube, respectively. The
magnet is observed to fall through the tube at a much slower rate than than the
dummy magnet.
EXTRA: Ask students which tube weighs more during this process. Hang aluminum
tube from a spring scale and observe the tube's weight change as the magnet
falls through it.
Equipment
Magnet, "Dummy" magnet,
Two 1.5 m Aluminum tubes
Optional:
Spring scale