Transcript Magnetism

Magnetic Field

[http://www.ac.wwu.edu/~vawter/PhysicsNet/Topics/Mag
neticField/gifs/B-FieldMagnet.jpg]
Area around a
magnet where the
magnetic “force”
could affect other
objects.
Magnetic Field

[http://www.school-for-champions.com/science/images/magnetic_detection2.jpg]
Compass needles
are magnets that
can rotate when
placed in a
magnetic field.
Movement of Magnetic North Pole
Movement of Magnetic South Pole
Magnetic Field
Magnetic
Poles
[http://www.wfu.edu/physics/pira/ResourceCD/ResourceI
mages/PhysicsDrawings/Magnetic_Field_Lines.gif]

Field lines are
always drawn from
North to South on
a magnet.
Magnetic Force
 Opposite
poles will attract.
[http://www.bbc.co.uk/schools/ks3bitesize/science/images/sci_dia_75.gif]
Magnetic Force
 Same
poles will repel.
[http://www.bbc.co.uk/schools/ks3bitesize/science/images/sci_dia_75.gif]
Magnetic Force
 Stronger
forces exist when magnets
are close to one another.
Click here for a magnetic force
demonstration.
Magnetic Force


Only certain metals
are magnetic. (ex:
iron, cobalt, nickel)
These metals can act
like magnets when
their magnetic
domains are aligned.
[http://www.mcdl.net/i/magnetic_domains.gif]
Magnetic Force
Permanent magnets are created when a
magnetic metal is surrounded by a
strong magnetic field.
 This can be accomplished by using
electric current!

Click Here for an Electricity &
Magnetism Demo