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What is the purpose of a junkyard electromagnet?

• To attract large pieces of scrap iron.

• To power a vehicle.

• To generate electricity.

• To heat a building.

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What is an electromagnet?

• A temporary magnet with a magnetic field produced by electric current.

• A permanent magnet that never loses its magnetism.

• A device that converts solar energy into electricity.

• A machine that uses wind to generate power.

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What is the function of the electromotive force in electric motors?

• To keep electrons in orbit and form bonds.

• To generate solar power.

• To produce wind energy.

• To heat the motor.

What is the unit of electric current?

• Volt

• Ampere

• Ohm

• Watt

What happens when you bring a positively charged object near a negatively charged object?

• They repel each other

• They attract each other

• They have no effect on each other

• They both become neutral

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What is observed when a balloon is rubbed on hair and brought close to a stream of water?

• The water moves toward the balloon

• The water moves away from the balloon

• The water remains still

• The water evaporates

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What causes lightning during a storm?

• The sun heating the clouds

• Positively or negatively charged areas attracting each other

• Wind blowing through the clouds

• Rain falling from the clouds

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What is an electromagnet?

• A permanent magnet with a constant magnetic field

• A temporary magnet with a magnetic field produced by an electric current

• A magnet that works only in water

• A magnet that does not require electricity

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What should be done to the iron rod to create a magnetic field using Earth's magnetic field?

• Heat it with a flame

• Hit one end with a hammer

• Soak it in water

• Freeze it

What is the role of the battery in an electromagnet?

• To cool down the wire

• To provide electric current

• To change the color of the wire

• To make the wire longer