3B Scientific Induction Tube Apparatus with 6 Coils - Manual

3B SCIENTIFIC ® PHYSICS
1
Free-Fall Tube with 6 Induction Coils U8511200
Instruction sheet
12/09 SP/ALF
1 Free-fall
tube
2 Coil
3 Connector
sockets
4 Plinth with socket
5 Bar
magnet
6 Cork mat
1. Description
The free-fall tube with 6 induction coils is used to
illustrate the principles of induced voltages.
The free-fall tube is a plastic tube that is mounted
upright on a plinth and has six identical induction
coils connected in series with one another. Within
the clamp socket of the plinth there is a rubber
washer, which prevents the falling body (a bar
magnet) from bouncing back up the tube after the
impact.
If the bar magnet is allowed to fall through the
tube, a voltage is induced in each of the coils in
turn. Since the velocity of the magnet increases with
time as it falls, the amplitudes of the voltage peaks
also increase as time passes, while their widths
decrease. The area under each of the voltage peaks
remains constant.