Tracy wants to make an electromagnet using a copper wire wrapped around an iron bar, as shown below.
To make the bar an electromagnet, what should Tracy do next?
a
heat the wire around the bar
b
touch the ends of the wire together
c
send a current through the wire
d
connect the wire to a bulb
c. send a current through the wire.
To create an electromagnet, an electric current needs to flow through a wire which is wrapped around an iron core. When an electric current flows through the wire, it creates a magnetic field, which in turn magnetizes the iron core, creating an electromagnet.