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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?
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
Which of these actions will increase the strength of the magnetic field produced around an electromagnet?
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
How can you turn an iron nail into an electromagnet?
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
Which objects could you combine to build an electromagnet?
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
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?
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
Which of the following is true about an electromagnet?
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
What happens to the magnetic field created by an electromagnet when the wire is disconnected from the source of energy?
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
The north pole of an electromagnet will attract
The magnetic field “turns off”
A screw
the south pole of a bar magnet
Wrap an electrical wire around it and include it in an open circuit.
Copper wire, source of electric current, steel screw
Increase the number of coils of the wire around the iron core
Increasing the voltage increases its strength.
The electricity in running through the wire produces a magnetic field and magnetizes the iron
Check it!