What is a magnet?
any material that attracts iron.
What mineral in rocks is magnetic?
magnetite.
What is magnetism?
the attraction or repulsion of magnetic materials.
Are magnetic rocks known as lodestones?
Yes.
What are three properties that magnets have?
1. Magnets attract iron and materials that have iron.
2. Magnets attract or repel other magnets.
3. One part of a magnet will always point north when allowed to swing freely.
What are the two ends of a magnet called?
magnetic poles.
What are two true facts about magnetic poles?
1. One pole of a magnet will point north.
2. The pole that points south is labeled the south pole.
Where is the magnetic force of a magnet strongest?
On the poles of a magnet.
How are magnetic poles labeled?
North and South poles
What is a magnetic force?
a force produced when magnetic poles interact.
Is this true: Any material that exerts magnetic force is considered a magnet?
Yes it is true.
What is a magnetic field?
The region of magnetic force around a magnet.
What are the lines called that map out the magnetic field around a magnet?
Magnetic field lines
When the magnetic fields of tow or more magnets overlap, what is the result?
a combined field.
What do the magnetic properties of a material depend on?
the structure of its atoms.
The smallest particle of an element is called?
an atom
What is the center region of an atom called?
nucleus
Why does each electron in an atom behave like a tiny magnet?
A spinning electron produces a magnetic field.
Is this statement false: Most materials have weak magnetic properties.
No it is true.
What is a magnetic domain?
a grouping of atoms that have their magnetic fields aligned.
Is this statement false: An entire magnetic domain acts like a bar magnet with a north and south pole.
No it is actually true!
What is a ferromagnetic material?
a material that shows strong magnetic properties
What are four common ferromagnetic materials found in nature?
iron, nickel, cobalt, gadolinium
What is the most commonly used magnet today?
ferrite
What is a temporary magnet?
A magnet made from a material that easily loses its magnetism.
What is a permanent magnet?
A magnet made of a material that keeps its magnetism.
An electric current produces what?
a magnetic field.
What is electromagnetism?
The relationship between electricity and magnetism.
What are two facts that are true about electric current and magnetism.
1. A wire with a current has a magnetic field
2. Iron filings can map out a magnetic field around a wire with a current.
What are the three characteristics of a magnetic field produced by a current?
1. The field can be turned off or on.
2. Have its direction reversed.
3. Have its strength changed.
How can you turn off a magnetic field produced by a current?
Simply turn the current off.
What is a solenoid?
A coli of wire with a current.
What are three true statements about solenoids?
1. The strength of the magnetic field increases as the number of loops increase.
2. The north and south poles of a solenoid change with the direction of the current.
3. If wire with a current is twisted into a loop, the magnetic field lines become bunched
What is an electromagnet?
A solenoid with a ferromagnetic core.
Describe four ways you can increase the strength of an electromagnet?
1. Increase the current in the solenoid
2. Add more loops of wire to the solenoid
3. Wind the coils of the solenoid closer together
4. Increase the strength of an electromagnet