Data Sheet

-110-
252. Magnets and Photons
Replace the switch (62) with the reed switch (83) in project #242, hold the
magnet (7) near the reed switch (83) and you will hear a faint siren from
the motor (95). Magnets attract to each other because they exchange
photons, just like particles that make up light. But unlike the photons coming
from a light source, these photons are virtual and you can’t see them.
253. Magnet Material
Replace the switch (62) with the reed switch (83) in project #242, place
a 4-wire (4) across points C and D. Hold the magnet (7) near the reed
switch (83) and you will hear a faint gun shot and machine gun sounds.
Most magnets are made of iron (like the magnet inside the casing for
the magnet module (7) in this set). But magnets can also be made of
any material with unpaired electrons including many metals and alloys.
254. Animals and Magnets
Replace the switch (62) with the reed switch (83) in project #242, place
a 4-wire (4) across points A and B and when you hold the magnet (7)
near the reed switch (83) you will hear the faint sound of an emergency
re siren. Some animals and bacteria have magnetite in their bodies. The
chiton, a type of mollusk, actually has magnetite in its teeth that cover
its tongue. This lets the animal scrape algae and can provide a homing
sense enabling chitons to nd their way back to their favorite places.
255. Neutron Star
Replace the switch (62) with the reed switch (83) in project #242,
place a 4-wire (4) across points E and F and when you hold the magnet
(7) near the reed switch (83) you will hear faint space battle sounds.
Did you know that a collapsed star, called a neutron star, has stronger
magnetic force than any other object in the universe?
256. Tesla
Replace the switch (62) with the reed switch (83) in project #242, place
a 4-wire (4) across points G and H and when you hold the magnet (7)
near the reed switch (83) you will hear music. Tesla is the unit used to
specify magnetic ux density. One Tesla is equal to one weber per square
meter. Weber is the unit of magnetic ux. One weber is the magnetic ux
that, linking a circuit of one turn, would produce in it an electromotive
force of 1 volt if it were reduced to zero at a uniform rate in 1 second.
WARNING: Moving parts. Do not
touch the motor during operation. Do
not lean over the motor.
!
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