Download Magnetism - Mr. Treon

PROPERTIES OF
MAGNETS
Learning Targets
8.1
I can recognize and explain what causes magnetic fields.
8.2
I can identify the shape and direction of the magnetic field
around a bar magnet.
Poles of Magnets
If you suspend a bar magnet from its center
by a piece of string, it will act as a compass.
• The end that points northward is called
the north-seeking pole.
• The end that points southward is called
the south-seeking pole.
• More simply, these are called the north
and south poles.
• All magnets have both a north and a
south pole. For a simple bar magnet the
poles are located at the two ends.
Properties of Magnets
• Magnetic poles behave
similarly to electric charges
in some ways (they can
attract and repel).
• Unlike electric charges, a
magnetic pole cannot be
isolated—if you cut a
magnet in half, the newly
cut faces become new
north and south poles.
How does a magnet affect
the space around it?
“Fields” of Force
• Both magnetic poles and electric charges have an ability to
apply an invisible force on objects around them.
• The space around an electric charge, in which an electric force
can be exerted, is called an electric field.
• The space around a magnet, in which a magnetic force is
exerted, is filled with a magnetic field.
• If we place another magnet or a small compass anywhere in
the field, its poles will tend to line up with the magnetic field.
The North pole
of a compass
needle is
repelled by the
North pole of a
magnet, so the
compass needle
points towards
the South pole
of the magnet.
So, we define the direction of a magnetic
field to be pointing from North to South.
https://phet.colorado.edu/en/simulation/magnet-and-compass
WHITEBOARD
CHALLENGE
Draw the magnetic field lines around the
following magnet.
Draw the magnetic field lines around the
following magnets.
Draw the magnetic field lines around the
following magnets.
Draw the magnetic field lines around the
following magnets.
Julius Sumner
Miller
Adventures in
Magnetism:
https://youtu.be/8DDw9o
lY0c8