Download magnetic field - DiMaggio

Magnetism Notes
 Magnet: any material that attracts iron or materials containing iron,
nickel, cobalt
 All magnets have a north and a south pole.
 The word attract is used when 2 magnets pull together.
o Unlike or opposites poles attract
 The word repel is used when 2 magnets push apart.
o Like or same poles repel
 This attraction or repulsion between magnetic poles is called magnetic
force
 Magnetic field- region around a magnet where magnetic forces can act
o Closer the field lines, stronger the magnetic field
Magnetic Fields Foldable
Attract
opposite poles attract
When metal objects enter a magnetic
field, the object is pulled in
Repel
like poles repel
Magnetism Notes
Making a Magnet:
 In a magnet, all the domains are lined up
 To line the domains up, just rub a magnet on the iron, cobalt, or nickel
object in 1 direction!
Destroying (demagnetizing) a Magnet:
 hammering it
 dropping it
 heating it
 What would happen if a magnet was cut in half?
o You would create 2 smaller magnets with new smaller poles!
Electromagnets:
 electromagnetism: the interaction between electricity and
magnetism
 When electric current flows through a wire, a magnetic field is
made
 An electromagnet is created by electricity going through a coil of
wire that has been wrapped around an iron or steel core
Magnetism Notes
 Solenoid: coil of wire with an electric current going through it
Compare and Contrast
Permanent Magnet
Both
 Can’t be turned on
or off
Electromagnet
Only works with
iron
temporary
Magnet
nickel
 Can be turned on
and off
cobalt
 How can we make this electromagnet stronger?
o increase the electric current
 Label the electromagnet below with solenoid, power source, iron core
 If you want to increase the magnetic field of your solenoid, all you need
to do is add more loops to your solenoid!