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Magnetism And Electricity
Test Description: Magnetism and Electricity
Instructions: Answer all questions to get your test result.
1) The region around a magent where the magnetic forces act is the
A
magnetic current
B
electromagnet pole
C
magnetic field
D
magnetic pole
2) Which of these can most easily produce magnetic fields?
A
wind
B
flowing water
C
sunlight
D
electricity
3) A compass needle moves when the compass is brought near a wire. What can you infer about the wire?
A
The wire is hot
B
Only one end of the wire is connected to a battery
C
The wire is aligned with the Earth's magnetic field
D
The wire has an electric current flowing through it
4) Which is the best way to generate an electrical current in a coil of wire?
A
lay the coil near a magnet
B
rub the coil with a piece of silk
C
rotate the coil in a magnetic field
D
heat the coil all the way through
5) A wire carrying electric current wrapped around an iron ore is called a(n)
A
battery
B
electromagnet
C
generator
D
conductor
6) An electromagnet is produced by running an electric current through a coil of wire. How would wrapping the wire around an iron core affect the electromagnet?
A
The strength of the electromagnet would decrease
B
The strength of the electromagnet would increase
C
The electromagnet would no longer conduct electricity
D
The electromagnet would no longer have magnetic properties
7) An electromagnet becomes magnetic only when
A
the current is blocked
B
it begins to glow
C
it loses power
D
electricity passes through
8) Why would a generator be an important part of an electrical circuit?
A
The circuit sends energy through the generator
B
The generator changes mechanical energy into electrical energy
C
The generator changes electricity into motion
D
The generator sends heat energy into the circuit
9) When an electric current flowing in a wire is moved through a magnetic field, electrical energy is transformed into _____ energy.
A
chemical
B
mechanical
C
heat
D
solar
10) What item is missing that could prevent a simple electric motor from working?
A
It needs a generator
B
It is missing the magnet
C
It needs a larger battery
D
It is missing the slip ring
*select an answer for all questions
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