Electromagnet 2023 Questions

What combination of Voltage and loops made the strongest magnet? Pick 3

• 4.5 V
• Close
• 30 loops
• 1.5 V
• 3.0 V

How can the electromagnet be made stronger?

• Reverse the poles of the magnet.
• Remove all the coils and the nail.
• Add more coils of wire to the nail.
• Use a smaller battery.

Surrounding every magnet is a

• another magnet
• electrical current
• magnetic field

In order for an electromagnet to be formed, an____a____current must pass through a coil of_____b____wrapped around an____c____core. a, b , c order

• electric, wire, iron
• iron, electric, wire
• excited, hair, apple

What is most likely to happen when the switch is closed?

• The battery will explode
• The nail will rust
• A magnetic field should be produced
• The wire will catch on fire

How do electromagnets differ from regular magnets?

• They can be turned off and on
• Their polarity can be reversed
• Their strength can be changed
• All of the above

A compass needle responds to a magnetic field, because the compass needle is a

• magnet.
• transformer.
• generator.
• motor.

Arrows are close together on a force field when the force is

• stronger
• weaker
• the same

What THREE ways are electromagnets different from permanent magnets?

• they can be turned off and on
• they can increase in strength by increasing the current in the wire
• they can change which is the north and south pole
• they are smaller in size

Electromagnets are useful in industry such as a junk yard because they

• have strong north and south poles
• are easy to lift
• can be turned off and on