Question

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

Answer 1

Step-by-step explanation:

I took the k12 quiz and got 100%

Answer 2

1).

Answer:

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.

Step-by-step explanation:

When current flows through the wire then it will produce magnetic field in the region of circular loop so it is magnetic effect of current that's why it is known as temporary electromagnet.

2).

Answer:

An iron nail

Step-by-step explanation:

Here for a better electromagnet we require a material which must be Ferromagnetic in nature.

So out of all given option best ferromagnetic material is an iron nail

3).

Answer:

Increase the voltage of a battery

Step-by-step explanation:

Here when we increase the voltage in battery then it will increase the current in the coil. Due to this increase in current the magnetic field will increase in that region.