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Science, Physics
9th -
12thgrade
AKS 9: Magnetism and Electromagnetism
16 questions
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- 1. Drop Down
The picture is an example of an: (a)
Electric circuitElectromagnetElectric nailElectric power cell - 2. Drop Down
You know this substance is magnetized because (a)
all the domains have right anglesthe arrows are drawn in redthe domains are alignedthe domains are random - 3. Multiple Choice
To make this electromagnet stronger you could:
use less wire
have fewer wire coils around the nail
have more wire coils around the nail
use a plastic core
- 4. Multiple Choice
What happens to the domains of a ferromagnetic material when they are placed in a strong magnetic field?
The domains aligned with the field become bigger
The number of magnetic domains increases
All the magnetic domains point in the same direction
The magnetic domains point randomly
- 5. Multiple ChoiceVoltage can be induced in a wire by
moving the wire near a magnet.
moving a magnet near the wire.
changing the current in a nearby wire.
all of these
- 6. Multiple ChoiceWhat would happen if I move a bar magnet in and out of a coil of copper wire?
Electric current would disappear
The magnet would explode
Electric current will flow through the wire (voltage induced)
It would produce a gravitational field
- 7. Drop Down
A magnet can move in a coil of wire to produce electricity in which system? (a)
GeneratorMotorMagnetTransformer - 8. Multiple Choice
Which action will increase the deflection of the galvanometer pointer?
The magnetic pole is reversed
The number of turns of coils is increased
The coil is made from insulated wire
The magnet is slowly pushed into the coil
- 9. Drop Down
If you break a bar magnet in half, each half...
(a)becomes a bar magnet with two poles.has only one pole.has only only a North pole.has only a South pole.loses all magnetic properties. - 10. Multiple ChoiceThe voltmeter is at 0 in this image. How would you manipulate the experiment to create electricity (measured in volts)?Flip the magnet around so the North pole is facing outMove the magnet back and forthTake the magnet outAdd more coils around the paper cylinder
- 11. Multiple Choice
Electronic devices create magnetic fields because they
are magnets
are compasses
have moving particles with electric charge
- 12. Multiple Choice
How can you test to see if there is a current running through a wire?
listen carefully to see if you hear a buzzing sound
place several compasses around the wire
place several batteries around the wire
- 13. Drop Down
A device that transforms electrical energy to mechanical energy is a (a)
generatormotortransformermagnet - 14. Multiple Choice
How are electromagnets different from permanent magnets?
magnets can be turned on/off
you can turn an electromagnet on/off
magnets are more powerful
magnets have a North and South pole
- 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.
- 16. Multiple Choice
Which of the following will produce the strongest electromagnet?
A coil of 20 turns of wire with no iron core
A coil of 20 turns of wire with an iron core
A coil of 40 turns of wire with no iron core
A coil of 40 turns of wire with an iron core
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