Electromagnets
Magnetism
Miscellaneous
Insolators and Conductors
Static Electricity
100
An object that is not usually magnetic but becomes magnetic after it interacts with an electric current.
What is an electromagnet?
100
Iron, nickel, steel, and cobalt are what type of metals?
What is magnetic.
100
An electric circuit through which current can flow in an uninterrupted path.
What is a closed circuit.
100
In some materials, electrons are not able to move freely into the conduction band. This is due to the large amount of energy needed to make them move. How is this type of material classified?
insulator
100
After rubbing a rubber brush on wool, Gilbert is able to use the brush to pick up small strips of paper. What causes the paper to be attracted to the brush?
static electricity
200
Wrapping a wire loosely around the core of an electromagnet does what to it?
What is decreases the strength.
200
An object that is only temporarily magnetized is called what?
What is a soft magnet.
200
An electrical circuit that is not complete.
What is an open circuit.
200
Which one of the following is NOT a good electrical insulator?
gold
200
Which of the following will always produce a magnetic force on a nearby iron nail?
an electric current
300
Coiling a wire tighter around the core of an electromagnet would do what to the electromagnet's strength?
What is increases the strength.
300
A magnet that is permanently magnetized is called what?
What is a hard magnet.
300
An experiment that keeps all things the same, except the thing you are trying to investigate.
What is a controlled experiment.
300
Why are metals generally good conductors of electric current?
Valence electrons flow among nuclei in metallic bonds so they can carry a current.
300
A scientist sets up an investigation. A positively-charged metal plate is placed in a container. The air in the container has a high concentration of floating dust. Some of the dust particles are attracted to the plate.
What property is shared by the dust particles that are attracted to the plate?
They are negatively charged.
400
What happens when you wrap a wire around a nail, and then turn on a switch to have electricity flow through the wire?
What is an electromagnet has been created.
400
How is a magnet able to pull another object towards itself from a distance?
What is through the magnetic field.
400
A name for the variable that is changed on purpose in a controlled experiment.
What is the independent variable?
400
A material with a very high electrical resistivity isMOST likely a
nonmetallic electrical insulator.
400
A rubber balloon is rubbed with a sample of animal fur. Afterward, the balloon has a net negative charge while the fur has a net positive charge. Which statement explains the transfer of charges between these two objects?
Negative charge moved from the animal fur to the balloon
500
It is possible to tell that electricity is flowing through the wires in an electromagnet when what happens to the core?
What is the core becomes a magnet.
500
What is the difference between a magnet and something that is magnetic?
What is a magnet can be attracted and repelled by another magnet, and something that is magnetic can only be attracted.
500
Electricity, a switch, and magnetism are the basic ingredients to make what work?
What is a motor.
500
In some materials, electrons are not able to move freely into the conduction band. This is due to the large amount of energy needed to make them move. How is this type of material classified?
insulator
500
A student removed a wool hat from her head. Her hair stood up from static electricity. What did her hat do to cause this?
removed electrons from her hair