Magnets Flashcards
What is a magnet
Anything that attracts iron and materials that contain
What is magnetism
The attraction or repulsion of a magnet
What does Fe mean
Iron
When all of the domains are lined up the object becomes____
Magnetized
Magnets have two ends. Each one is called ____
Magnetic poles
One end if the magnet always points ____ and the other end points ____
North
South
Opposites ____ likes____
Attract
Repel
What are the steps to sea floor soreading
Ocean floor rock is formed by molten material that seeps through a crack in the ocean floor. The magnetic material in the molten rock lined up with the direction of earths magnetic field. When the rock cools it creates a permanent record of magnetic field.
What is a deep ocean trench
Deep under water canyon that forms where oceanic crust bends and subduction takes place here
What is the evidence for sea floor spreading
Molten material
Magnetic stripes
Drilling samples
What is subduction
Process by which oceanic crust sinking beneath trench into the mantel.
Where does sea floor speeding begin
Mid ocean ridges
What is the magnetosphere caused by
Solar wind
What is an aurora
A glowing movement in the atmosphere caused by charged particles from the sun
True or false
Earths magnetic field has completely moved direction every millions of years or so
True
What is a compass
A device that has a magnetized needle that spins freely
The angle between a line to the geographic North Pole and the north to which a compass points is known as what
Magnetic declination
What is magnetic declination depend on
Your location
What produces magnetic fields
The spinning electrons
Where is the magnetic force of a magnet the strongest
At its poles
Permanent magnets keep there what for a long time
Magnetism
Do magnetic field lines cross
No
What charge does and electron have
Negative charge
True or false
Ferromagnetic materials show strong magnetic propertys
True
Two south poles are brought near each other.
Repel or attract
Repel
A North Pole and a South Pole are brought near each other
Repel or attract
Attract
Two north poles are brought be reach other
Repel
A South Pole is brought near a North Pole
Repel or attract
Attract
The region of magnetic force around a magnet is known as its
Magnetic field
Be able to draw a magnetic field around a magnet
http://images.tutorvista.com/content/magnetic-effects-electric-current/bar-magnet-magnetic-field.jpeg
When the magnetic fields of two or more magnets overlap what is the result
Combined field
