Electromagnetism

Which components do you need to build an electromagnet?

• a wire, a conductor, a battery and some paper clips.

• wool, a conductor, a battery and some paper clips.

• a wire, a compass, a battery and some paper clips.

 What kind of magnet can be turned on and off?

• refridgerator magnet

• magnetite

• electromagnet

• iron

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

• Remove all the coils and the nail.

• Add more coils of wire to the nail.

• Reverse the poles of the magnet.

• Use a smaller battery.

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What happens when an electric current flows through a wire?. 

• The wire begins to spin.

• A field of gravity is created around the wire.

• Nothing happens.

• 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

• not affect

• increase

 

What type of core is best for electromagnets?

• steel

• plastic

• iron

• copper

 

What conclusion can you draw from this graph?

• As current increases, magnetic strength decreases.

• As current decreases, magnetic strength increases

• As current increases, magnetic strength increases.

• There is no relationship between current and magnetic strength.

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Which answer describes a magnet best?

• A material that has two north poles

• A material that has a north and a south pole

• A material that has a two south poles.

• an electron

 

 

The ability of some materials to attract certain metals is called

answer choices

Electricity

Magnetism

Electromagnetism

Atoms

• Electricity

• Magnetism

• Electromagnetism

• Atoms

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 How do you make an electromagnet stronger?

• Add a motor and/or lightbulbs

• Add a motor and/or lightbulbs

• Add more light bulbs and/or wire coils

• add more wire coils and/or batteries