1.)

why is an electromagnet a temporary magnet?

question options:

an electromagnet is only a magnet if a current flows through the wire continuously.

an electromagnet cannot be turned on and off.

an electromagnet becomes a magnet when a current flows through the wire. an electromagnet no longer acts as a magnet when the current flow stops.

an electromagnet is a magnet when no current flows through the wire. the electromagnet no longer acts as a magnet when current flows through the wire.

2.)

an electromagnet can be made by wrapping wire around which object?

question options:

a glass bottle

a pencil

an iron nail

a rubber duck

3.)

which change will most likely increase the strength of a magnetic field produced by an electromagnet?
question options:

reduce the number of turns of the coil

switch the direction in which the battery is connected

remove the iron nail

increase the voltage of a battery