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- 1. 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. - 2. Multiple ChoiceSurrounding every magnet is a(n) __________ __________.magnetic fieldelectrical currentsmaller magnetfunny saying
- 3. Multiple ChoiceWhat kind of magnet can be turned on and off?a refrigerator magnetan electromagnetmagnetiteiron
- 4. Multiple ChoiceWhat's the difference between a solenoid and an electromagnet?Solenoids do not use a power source.Electromagnets include a nail inside the coils.Solenoids include a nail inside the coils.Electromagnets do no use wire.
- 5. Multiple ChoiceWhen two magnetic North poles are brought close to each other, they willattractrepelcreate sparkscancel each other out
- 6. Multiple ChoiceAll electric currents produces a magnetic fieldTrueFalse
- 7. Multiple Choice
How would you compare the magnetic field generated by a simple length of wire to the magnetic field generated by a coil of wire?
The coil generates a stronger magnetic filed
The coil generates a weaker magnetic field
The field generated by the coil has different polarity than the field generated by the length of wire
The coil generates a field that attracts iron objects; the length of wire generates a field that attracts silver objects.
- 8. Multiple Choice
1) A wire carries a current, creating a magnetic field around itself as shown. The current in the wire is:
A. Directed to the right
A. Directed to the left
A. Equal to the magnetic field
In the same direction as the magnetic field
- 9. Multiple ChoiceIf you cut a magnet in half, what happens to the poles?One half gets the North Pole, the other half gets the South PoleBoth halves get only a North PoleBoth halves get only a South PoleBoth halves get a North pole and a South Pole
- 10. Multiple ChoiceIf two magnetic South poles are brought near each other, what would the magnetic field lines look like?the lines would connect between the polesthe lines would move out, but then curve away from each otherthe lines would curve like an "S"since South poles repel, there would not be any lines
- 11. Multiple Choice
An electromagnet can be made stronger by:
increasing the number of turns in the coil
putting a piece of soft iron in the core
increasing the current through the coil
any or all of the above
- 12. Multiple Choice
A student did an experiment to determine the effect of a magnetic field p a moving steel sphere. The student recorded the motion of sphere in trial one and then drew the desired motion of the steel sphere for trial 2 as shown in the diagram. If the steel sphere has the same initial velocity in both trials, which motion would best help to achieve the motion of the steel sphere shown in trial 2?
putting a resistor between the battery and the switch
replacing the nail with one made out of aluminum
reversing the poles of the iron core
increasing the number of coils of the copper wire
- 13. Multiple Choice
What can you do to make electromagnets stronger?
Increase number of coils of wire.
Increase number of batteries used.
Both A and B.
Neither A nor B.
- 14. Multiple Choice
Why did this simple electric motor work?
The current from the battery induces a magnetic field in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet
The electromagnet on top of the battery pulls on the magnetic copper wire
The magnet induces a current in the copper loop which makes it rotate.
The magnetic field from the battery induces an electric current in the copper loop, turning it into an electromagnet that repels from/attracts to the permanent magnet
- 15. 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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