Download TCAP Worksheet #9 – Magnets

Magnets
TCAP Worksheet #9
Magnets
• Any material that
attracts iron or
materials
containing iron.
• Magnets have a
North and South
pole.
• Magnetism
depends on the
material’s atoms.
Magnetic Domains
• If most of the domains in an object are
aligned, the magnetic fields of the
individual domains combine to make the
whole object magnetic.
Demagnetized
• When
•
domains
move, the
•
magnet is
demagnetized.
• HOW??
Dropping a magnet or
hitting it too hard.
Putting the magnet in
a strong magnetic field
that is opposite to its
own.
• Increasing
temperatures of a
magnet.
Types of Magnets
• Ferromagnets –
Magnets made
with iron, nickel,
cobalt, or
mixtures of those
metals.
• Electromagnets –
Magnets made
by an electric
current.
• Temporary –
Magnets made from
materials that are
easy to magnetize.
• Permanent –
Magnets made from
materials that are
difficult to magnetize
but keep their
magnetism.
Earth as a Magnet
• The North Pole
and the Magnetic
North Pole are
two different
locations.
• Same with the
South Poles.
Electromagnetism
• Electromagnetism • Electric current
- The interaction
produces a
between electricity
magnetic field.
and magnetism
• Therefore, you
can use
electricity to
produce a
magnet.
Solenoid
• Solenoid is a coil of
wire that produces
a magnetic field
when carrying an
electric current.
• An electromagnet is
a solenoid wrapped
around an iron core.
• This is a magnetic
field.
Solenoid
• Strength of a
solenoid can
increase by two
ways.
• More loops in the
wire.
• Electric current is
increased.
Electromagnetism
• Example –
Doorbell
• When the current
is turned off, then
the magnet is
“turned off”
Measuring
• Galvanometer is
used to measure
electric current.
Electricity from
Magnetism
• Electromagnetic
induction is the
process of
creating a current
in a circuit by
changing a
magnetic field.
• You can move the
magnet through the
coil wire. (Changing
the magnetic field).
• Move it faster
through the coil wire.
• Remove the magnet
from the coil wire.
• Add more loops to
wire.
• Eek!