Science Test: Chapter 1- magnetism review
Terms in this set (27)
What is a nucleus?
The center of every atom
Where is the magnetic force strongest?
At the north and south poles
Do magnetic field lines ever cross?
What happens if you break a magnet in two?
You get two smaller magnets
What does the amount of magnetic declination depend on?
Where are you are on the earths surface
How does the solar wind affect the earth's magnetic field?
It causes earth's magnetosphere to spread farther on the side of the earth not facing the sun
What is an Atom?
Smallest part of an elementthat has properties of that element
What is a permanent magnet?
It keeps its magnetism for a long time
What is the magnetosphere?
It's the region of earths magnetic field shaped by the solar wind
What is a magnet?
A material that attracts iron and material that contains iron
What kind of poles does a compass line up with?
Magnetic north pole
What is the magnetic force around a magnet
What is a magnetic domain?
A group of Atoms that have their magnetic fields lined up in the same direction
What is an Aurora?
A glowing region caused by charged particles from the sun
What are the van Allen belts?
To donut shaped region's above the earth surface that contain electrons and protons traveling at high speeds
Will heating a magnetic destroy its magnetism?
What are electrons?
They are in the outer region of an Atom and they carry negative charge
What is a temporary magnet?
It easily loses its magnetism
Does a ferromagnetic material show strong magnetic properties?
Yes because it contains siren
Explain attraction and repulsion between the poles of a magnet.
Opposite poles attract and like poles repel
How do scientists know that earth's magnetic field has changed over time?
Rocks on the ocean floor have iron lined up in the same direction
Why are most materials non-magnetic?
In most Atoms electrons form pairs that been in opposite directions that cancel each other
What are the three properties of a magnet?
They attract iron and things that contain iron,they attract or repel each other, Point north one allowed to swing freely
Where are the magnetic fields strongest between two magnets?
Between the poles of the two magnets
How can an unmagnetized ferromagnetic material be made into a magnet?
You can place it in a strong magnetic field or rub it against a strong magnet
Describe the domains in a magnetized and unmagnetized domain.
Magnetized Atoms are pointed in the same direction but unmagnetized Atomspoint every which way
How can earth act as a magnet maker?
If an iron bar stays in the north or south pole for many years it causes atoms to line up in the same direction