magnetic basics
what are the two poles of a magnet called?
North pole and south pole
What do we call the magnetic field surrounding Earth?
Earth's mgnetosphere
What household item uses magnets to keep doors closed?
A refrigerator door.
What do magnetic field lines show?
Direction and strength of a magnetic field
What happens when a magnet is cut in half?
Each half becomes a new magnet with a north and south pole.
what happens when the opposite poles of two magnets are brought together?
They attract
which direction does a compass needle point?
Towards the north
What does earths magnetic field do?
Gravity
How do field lines behave around a magnet's poles?
They come from the North Pole and curve back into the South Pole
True or false: All metals are magnetic
False
what material are most magnets made of?
Iron, nickel, or cobalt
Why is Earth's magnetic field important?
Protects of from dangers of space.
How do magnets help in sorting recyclable materials?
Magnets separate metals like steel and iron from other materials.
What does it mean when magnetic field lines are close together?
The magnetic field is strong in that area.
What happens to magnets when they are heated to a very high temperature?
They lose their magnetism
what do we call the area around a magnet where magnetic forces can be felt?
Magnetic field
what creats Earth's magnetic field?
liquid iron
Name one medical device that uses magnets
MRI
What shape are the field lines around a wire?
Circular
Who discovered the relationship between electricity and magnetism?
Hans Christian Oersted.
Why is Earth's magnetic north pole not the same as the geographic north pole?
Earth's magnetic field shifts over time.
What type of magnets are used in speakers to create sound?
Electromagnets
What device uses Earth's magnetic field to determine direction?
A compass
What is the strongest natural magnet on Earth?
Magnetite or Lodestone