Magnets
Electromagnets
Earth
Motors/Generators
Miscellaneous
100
Explain the difference between a permanent and temporary magnet. 
A temporary magnet will lose its magnetism a lot easier.
100

How is an electromagnet different from a permanent magnet?

You can turn it on and off. You can change the strength of it.
100
What is a natural magnet?
A magnet that is naturally magnetized by the earth.
100
A motor converts ________ energy into __________ energy
electric, mechanical
100
What are the three materials that magnets can be made of?
Iron, Nickel, Cobalt
200
If you cut a magnet in half, what happens?
You end up with two magnets.
200
What is a solenoid?
Coiled wire
200
What part of a compass always points to earth's north pole?
north
200
What is used to measure current?
Galvanometer or ammeter
200
What is magnetic force?
The push or pull of a magnet on another material.
300
Opposite poles ___________, like poles ____________.
attract, repel
300
What three things are needed to create an electromagnet?
power source, iron core, solenoid
300
Why is the earth's magnetic field important?
it protects us
300
A generator converts ___________ energy into ___________ energy.
mechanical, electrical
300
What are three things that magnets are used for?
cell phones, MRI machines, moving metal at junk yards
400
Where does magnetism come from?
Electrons moving through an object that are aligned in orderly rows within the domains.
400
How is an electromagnet similar to the earth?
both have magnetic fields, poles, etc
400
What part of the imaginary bar magnet is at the earth's geographic north pole?
south
400
What are two things that generators are used in to create electricity?
dams, wind mills, nuclear plants
400

Explain Oersted's experiment.

He ran an electric current through a wire and the compass no longer pointed north.
500
What is the term for the interaction between electricity and magnetism?
electromagnetism
500
What are 3 things that can increase the strength of an electromagnet?
more coils, closer coils, stronger battery, ferromagnetic core
500
What do scientists think causes the earth's magnetic field?
electrical charges within the earth's core
500
What are three uses of electric motors?
fans, dryers, computers
500
Who discovered that a magnet would create an electric current when moved through a solenoid?
Faraday
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