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Why are some materials not magnetic even though each atom has its own tiny magnetic field?
because the magnetic fields of their atoms point in many different directions and cancel each other out
How does a temporary magnet differ from a permanent magnet in behavior after removing an external magnetic field?
a temporary magnet loses its magnetism when removed from a magnetic field while a permanent magnet retains it
What name describes elements that have an especially strong attraction to magnets?
ferromagnetic elements
(Double candy if you get this correct) Why doesn't a compass point directly to Earth's geographic north pole?
because Earth's magnetic north pole is not exactly at the geographic north pole; the compass aligns with the magnetic field, not geographic coordinates
What do magnetic field lines show about a magnet?
The strength and direction of the magnetic force
a force created by a magnet that can act without contact and cause attraction or repulsion.
magnetic force
What is the main cause of Earth's magnetic field according to current scientific understanding?
molten iron and nickel in Earth's outer core
Name one practical device that uses a very strong magnetic field to create images of the human body
MRI machine
This common element is strongly attracted to magnets and is found in many magnetic objects.
iron
What is an MRI machine using to create images of the human body?
A very strong magnetic field
What will happen when you bring the north pole of one magnet near the north pole of another?
they will repel each other
What 2 ways can you increase magnetic potential energy?
pulling apart 2 opposite poles of a magnet
pushing 2 together 2 similar poles of a magnet
If two opposite poles of magnets are pulled apart, what happens to the magnetic potential energy?
it increases
Where on a magnet is the magnetic force strongest?
at the magnetic poles
What is the main method by which a magnetic material becomes magnetized (aligning tiny regions)
placing it in a strong magnetic field that causes its magnetic domains to align
What are some ferromagnetic materials?
iron, nickel and cobalt
A region in a magnetic material where the magnetic fields of atoms all point in the same direction
magnetic domain
A compass needle points north because it responds to this.
Earth's magnetic field
If a bar magnet is broken into two pieces, what can be said about the poles of each piece?
each piece will have a north and a south pole
When a magnetic force causes an object to move, it is doing _____________ on the object
work