Elenco Snaptricity&reg - Manual (Page 56)

Snappy says: an electronic
magnet is much better than
an ordinary magnet because
you can turn it on or off with a
switch!
-55-
Electronic Magnet
Educational Corner:
An electron current flowing in a
wire has a tiny magnetic field.
By looping a long wire into a
coil the tiny magnetic field is
concentrated into a large one. The strength of the magnetic
field depends on how much
current is flowing in the wire
and how many loops of wire.
Iron Core Rod
Rubber Grommet
Project #46
Hold the electromagnet near something made of iron and
push the switch (S2). While pressed, the electromagnet will
attract small metal parts like nails or will stick to a hammer
or refrigerator. Release the switch and the attraction
disappears.
Operation
Pressing the switch turns on an electric current which
transforms the electromagnet from an ordinary coil of
copper wire into a magnet.
Description
Build the circuit shown. Place the iron core rod inside the
electromagnet (M3) and secure it with the rubber grommet.
This project works best if you have new alkaline batteries.
Assembly