Electromagnetism

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

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

• decrease

• increase

• not affect

What type of core is best for electromagnets?

• Steel

• Iron

• Plastic

• Copper

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

• increases

• decreases

• stays the same

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NGSS.MS-PS2-3

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What conclusion can you draw from this graph?

• As current increases, magnetic strength decreases.

• As current increases, magnetic strength increases.

• As current decreases, magnetic strength increases.

• There is no relationship between current and magnetic strength.

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What is/are the difference(s) between a magnet and an electromagnet? (two correct choices)

• An electromagnet can be turned on/off.

• A magnet can be turned off.

• An electromagnet is stronger.

How can a magnet be used to produce an electric current?

• Hold a magnet next to a piece of wire.

• Wrap wire around a magnet.

• Spin the magnet around inside a coil of wire.

What must the electrons do in an object to give it a magnetic field?

• Flow in the same direction

• Flow in the opposite direction

• Collide into one another

• Equal the number of protons and neutrons

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NGSS.MS-PS2-3

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What is an electromagnet?

• a magnet that creates an electric current

• a magnet created by an electric current

• a magnet that has an electric charge

• an electric charge that is magnetic