EF Investigation 3 Question Preview (ID: 49620)
Electromagnets.
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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 fewer times around the nail, THEN the strength of the electromagnet will increase
d) IF the wire is coiled more times around the nail, THEN the strength of the electromagnet will increase
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 pencil
b) A pen
c) A piece of chalk
d) A screw
Which objects could you combine to build an electromagnet?
a) Copper wire, source of electric current, steel screw
b) Battery, generator, steel screw
c) Compass, source of electric current, copper wire
d) Battery, lightbulb, plastic straw
Which of these actions will increase the strength of the magnetic field produced around an electromagnet?
a) Connect the wire to a device such as a lightbulb
b) Disconnect the wire from the energy source
c) Increase the number of coils of the wire around the iron core
d) Wrap the wire around a piece of wood
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 electricity in running through the wire produces a magnetic field and magnetizes the iron
b) The nail is a special type of nail
c) The paper clips will magnetize the nail
d) Being close to the battery magnetizes the nail
What happens to the magnetic field created by an electromagnet when the wire is disconnected from the source of energy?
a) The magnetic field becomes stronger
b) The magnetic field reverses direction
c) The magnetic field “turns off”
d) The magnetic field stays the same
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.
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 an open circuit.
d) Wrap an electrical wire around it and include it in a closed circuit.
The north pole of an electromagnet will attract
a) the north pole of a bar magnet
b) the south pole of a bar magnet
c) both poles of a bar magnet
d) neither pole of a bar magnet
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) thermal energy
b) a magnetic field
c) light energy
d) a sound wave
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