Use the image to answer the question.
A wire is wrapped around an iron core such as a nail and is connected to a 9-V battery.
An illustration shows an electromagnet made by wrapping wire around a nail. The two ends of the wire are connected to a battery, and the electromagnet attracts pins.
What is the role of the iron core or nail in this case?
(1 point)
Responses
It increases the voltage to twice its original value.
It increases the voltage to twice its original value.
It amplifies the magnetic field.
It amplifies the magnetic field.
It changes the direction of the electron flow.
It changes the direction of the electron flow.
It slows down the current.