Magnets
What would happen if the north ends of two magnets were close together?
Repel
Socks taken from a clothes dryer that stick together or a lightning bolt in the sky are examples of ____________.
Static Electricity
True or False: An electromagnet is a permanent magnet.
False
How can you increase the strength of an electromagnet?
What is by increasing the number of coils or the current flowing through the wire?
What is a tool with a magnetized needle free to turn?
a compass
If a south end of a magnet is close to a north end of a magnet, the magnets will _________.
attract
If you rub your hair on a balloon and the balloon becomes negatively charged, what charge will your hair have?
Positive Charge
True or False: An electric crane is an example of an electromagnet.
True
Explain how an electric current can create a magnetic field.
As the charges move, they create a magnetic field
What are patterns that show a magnets field?
True or False: All magnets have the same shape and size.
False
What is the flow of electric charge called?
What is electric current?
True or False: A refrigerator magnet is a permanent magnet.
Permanent Magnet
What is an object that attracts, or pulls on, certain materials, mainly iron?
What is a magnet?
True or False: All magnets have a north and south pole.
True
What is the tool that measures current called?
What is an ammeter?
An electromagnet is made up of what three items?
What is an iron bar (nail), battery, and a wire?
How can you increase the strength of the electromagnet and permanent magnet?
Magnets can be brought closer together.
OR
The number of loops can be increased.
What is a device that opens or closes a circuit?
A switch
Will a magnet attract copper, rubber, iron, or plastic?
Iron
What is the term for a material that does not conduct electricity?
What is an insulator?
How can you make an electromagnet stronger?
(2 ways)
More Coils
and
A Larger Core
What would happen if the entire unit is moving, but the magnet and coil are not moving relative to one another?
There will be no electric induction.
What is a material that allows electricity to move easily through it?
Conductor