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EF Investigation 3
Test Description: Electromagnets
Instructions: Answer all questions to get your test result.
1) Which of the following is true?
A
IF the wire is coiled more times around the nail, THEN the strength of the electromagnet will decrease
B
IF the piece of iron is bigger, THEN the strength of the electromagnet will decrease.
C
IF the wire is coiled more times around the nail, THEN the strength of the electromagnet will increase
D
IF the wire is coiled fewer times around the nail, THEN the strength of the electromagnet will increase
2) In an electromagnet, a current is passed through loops of wire that surround a core. Which material would be best to use as the core of an electromagnet?
A
A pen
B
A pencil
C
A screw
D
A piece of chalk
3) Which objects could you combine to build an electromagnet?
A
Battery, lightbulb, plastic straw
B
Battery, generator, steel screw
C
Compass, source of electric current, copper wire
D
Copper wire, source of electric current, steel screw
4) Which of these actions will increase the strength of the magnetic field produced around an electromagnet?
A
Disconnect the wire from the energy source
B
Increase the number of coils of the wire around the iron core
C
Wrap the wire around a piece of wood
D
Connect the wire to a device such as a lightbulb
5) An iron nail is not normally magnetic. In an electromagnet, the iron nail can attract iron and steel. How can a nail become magnetized in an electromagnet?
A
The nail is a special type of nail
B
The paper clips will magnetize the nail
C
The electricity in running through the wire produces a magnetic field and magnetizes the iron
D
Being close to the battery magnetizes the nail
6) What happens to the magnetic field created by an electromagnet when the wire is disconnected from the source of energy?
A
The magnetic field reverses direction
B
The magnetic field becomes stronger
C
The magnetic field stays the same
D
The magnetic field “turns off”
7) Which of the following is true about an electromagnet?
A
Increasing the voltage increases its strength.
B
The current may not be turned on or off.
C
Its strength is reduced by adding more loops of wire around the nail.
D
Its strength is reduced by increasing the voltage.
8) How can you turn an iron nail into an electromagnet?
A
Give the nail a strong static electric charge.
B
Rub the nail with a strong bar magnet.
C
Wrap an electrical wire around it and include it in a closed circuit.
D
Wrap an electrical wire around it and include it in an open circuit.
9) The north pole of an electromagnet will attract
A
neither pole of a bar magnet
B
the north pole of a bar magnet
C
the south pole of a bar magnet
D
both poles of a bar magnet
10) Students attached both ends of along wire to the poles of a battery and wound the wire around a spoon. They found that the spoon will now pick up small objects made of iron. This is because the flow of electricity is able to produce
A
light energy
B
a sound wave
C
a magnetic field
D
thermal energy
*select an answer for all questions
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