Electromagnetism

This is a picture of a simple electromagnet. How can the electromagnet be made stronger?

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

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What kind of magnet can be turned on and off?

• refridgerator magnet
• electromagnet
• magnetite
• iron

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

• A. generator.
• B. motor.   
• C. magnet.
• D. transformer.

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The area around a magnet is called the .....

• attraction zone

• work area

• magnetic field

• hot zone

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What is true about electricity and magnetic fields?

• Electricity is needed to create any magnet.
• Electricity always creates a magnetic field.
• Electricity is stronger than a magnetic field.
• Electricity prevents magnetic fields from occurring.

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How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs
• Add more light bulbs and/or wire coils
• add more wire coils and/or a switch
• add more wire coils and/or batteries

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What happens when an electric current flows through a wire?

• The wire begins to spin.

• Nothing happens.

• A field of gravity is created around the wire.

• A magnetic field is created around the wire.

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Increasing the number of coils in an electromagnet will _________ the power of the magnet.

• decrease

• increase

• not affect

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What type of core is best for electromagnets?

• Steel

• Iron

• Plastic

• Copper

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As the strength of a magnetic field increases, the ability to attract metal objects ____________.

• increases

• decreases

• stays the same

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