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- 1. 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.
- 2. Multiple Choice
Particles with opposite charges ____________ and particles with same (or like) charges ____________.
attract, repel
repel, repel
attract, attract
repel, attract
- 3. Multiple ChoiceHow do you make an electromagnet stronger?Add a motor and/or lightbulbsAdd more light bulbs and/or wire coilsadd more wire coils and/or a switchadd more wire coils and/or batteries
- 4. Multiple Choice
This 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. - 5. Multiple Choice
Which of the following is not a good conductor?
Copper
Silver
Aluminum
Plastic
- 6. 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.
- 7. Multiple Choice
What does this image show?
Parallel circuit
Series circuit
Magnet
Electromagnet
- 8. Multiple Choice
The area of magnetic force around a magnet is known as its ____________.
magnetism
magnetic current
magnetic field
electric current
- 9. Multiple Choice
Increasing the number of coils in an electromagnet will _________ the power of the magnet.
decrease
increase
not affect
- 10. Multiple Choice
What type of core is best for electromagnets?
Steel
Iron
Plastic
Copper
- 11. Multiple Choice
As the strength of a magnetic field increases, the ability to attract metal objects ____________.
increases
decreases
stays the same
- 12. 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.
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