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- 1. Multiple Choice
What is magnetic force?
A force exerted by electrically charged particles
The attractive and repulsive forces between two poles
A force exerted by magnets that makes an object become electrically charged
A force exerted by a magnet only when it physically touches an object
- 2. Multiple Choice
Which of the following is not a good conductor?
Copper
Silver
Aluminium
Plastic
- 3. Multiple Choice
Particles with opposite charges ____________ and particles with same (or like) charges ____________.
attract, repel
repel, repel
attract, attract
repel, attract
- 4. Multiple Choice
Which part of a circuit is responsible for "pushing" charges around a circuit?
Electrical devices
Power source
The wire
None of the above
- 5. Multiple Choice
What happens to the strength of a magnetic field as you move away from the magnet?
The strength of the magnetic field increases.
The strength of the magnetic field doesn't change.
The strength of the magnetic field is doubled.
The strength of the magnetic field decreases.
- 6. Multiple Choice
What is responsible for creating a magnetic field around Earth?
Earth's crust
Earth's iron core
Earth's mantle
Earth's atmosphere
- 7. Multiple Choice
What is a magnetic material?
A material that becomes positively charged when a magnet is brought near it.
A material that produces a magnetic force.
A material that becomes negatively charged when a magnet is brought near it.
A material that is attracted or repelled by a magnet.
- 8. Multiple Choice
What is the difference between a conductor and insulator?
conductor: allows electricity to flow easily.
insulator:does not allow electricity to flow easily
conductor: does not allow electricity to flow easily
insulator: allows electricity to flow easily
- 9. Multiple Choice
An object with a magnetic field is called a what?
electromagnet
magnet
circuit
magnetic material
- 10. Multiple Choice
Which is not a way to strengthen an electromagnet?
Use a bigger power source
Use a plastic wire
Use a bigger magnetic material
Wrap the wire around the magnetic material more times.
- 11. Multiple Choice
The picture above is an example of what?
Magnetic field
Electric field
Repulsion
Attraction
- 12. Multiple Choice
What would happen with the magnets in the picture above?
They would repel
Nothing
They would attract
They would repel and then attract
- 13. Multiple Choice
Why are these magnets not touching?
They are like poles and are repelling
They are opposite poles and are repelling
There is an electric field
- 14. Multiple ChoiceThis is a picture of a simple electromagnet. How can the electromagnet be made stronger?Add more coils of wire to the nail.Use a smaller battery.Reverse the poles of the magnet.Remove all the coils and the nail.
- 15. Multiple Choice
What happens when an electric current flows through a wire?
The wire begins to spin.
Nothing happens.
A field of gravity is created around the wire.
A magnetic field is created around the wire.
- 16. Multiple Choice
What type of core is best for electromagnets?
Steel
Iron
Plastic
Copper
- 17. Multiple Choice
As the strength of a magnetic field increases, the ability to attract metal objects ____________.
increases
decreases
stays the same
- 18. Multiple Choice
What conclusion can you draw from this graph?
As current increases, magnetic strength decreases.
As current increases, magnetic strength increases.
As current decreases, magnetic strength increases.
There is no relationship between current and magnetic strength.
- 19. Multiple Choice
What is/are the difference(s) between a magnet and an electromagnet?
An electromagnet can be turned on/off.
A magnet can be turned off.
An electromagnet is stronger.
- 20. Multiple Choice
How can a magnet be used to produce an electric current?
Hold a magnet next to a piece of wire.
Wrap wire around a magnet.
Spin the magnet around inside a coil of wire.
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