Electromagnets and Their Applications

What creates a magnetic field in an electromagnet?

• A permanent magnet

• A static charge

• A moving electric current

• A chemical reaction

What is a solenoid?

• A coil of wire

• A type of battery

• A type of permanent magnet

• A chemical compound

What happens when you place a ferromagnetic material inside a solenoid?

• The solenoid stops working

• The magnetic field becomes stronger

• The magnetic field remains the same

• The magnetic field weakens

Where can you find electromagnets being used?

• In cell phones

• All of the above

• In computers

• In hard drives

What is the main advantage of maglev trains over traditional trains?

• They are cheaper to build

• They use less electricity

• They have very little friction

• They can carry more passengers

How do maglev trains float above their tracks?

• Using basic magnetic principles

• Using wheels

• Using hydraulic lifts

• Using air pressure

What is the speed capability of some maglev trains?

• 112 kilometers per hour

• 500 kilometers per hour

• 250 kilometers per hour

• 750 kilometers per hour

How is the movement of maglev trains controlled?

• By changing the polarity of the magnetic fields

• By using wheels

• By using a traditional motor

• By adjusting the air pressure

What is one environmental benefit of maglev trains?

• They release CO2 into the atmosphere

• They are noisy

• They don't release CO2 into the atmosphere

• They use fossil fuels

What can you use to make your own electromagnet at home?

• A glass rod and a magnet

• Insulated copper wire and an iron nail

• A piece of wood and a string

• A plastic rod and a rubber band