Transcript Interactions_C2-Making magnets

My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
A question to think about…
How can we make
magnets?
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
The stroke method
• Notice that the iron
filings are not attracted
to a magnetic object
such as an iron nail.
To make the iron nail
into a magnet, you
will need a strong bar
magnet and a
magnetic object.
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
The stroke method
• First, stroke the iron
nail about 20 times
with one pole of a bar
magnet.
• Take note to stroke with the same pole.
• Always repeat your strokes in the same
direction.
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
The stroke method
• Next, try to pick up the iron filings with the nail
again.
• The magnetised iron nail will be able to attract
the iron filings.
• The iron nail has now become a magnet.
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
The electrical method
• If
The
We
To
the
make
can
electromagnet
iron
also
an
nailmake
can pick
is only
up
magnets
electromagnet,
the
a
magnet
sameusing
things
whenelectricity.
coil
itas
is a
anbar
electric
magnet,
itmade
has
toatanow
least
battery
20or
• connected
Magnetswire
this way
times
become
a
source
around
aofelectromagnet.
electricity.
a magnetic
are
called
such
an iron
• object
electromagnets.
The
iron
nailas
loses
its
nail.
magnetism once it is
• disconnected,
Connect the ends
andof
will
the
not
wireable
be
to atobattery.
attract
magnetic objects.
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited
My Pals are Here! Science © 2008 Marshall Cavendish (Singapore) Private Limited