Electromagnetism

What happens to the strength of a magnetic field as you move away from the magnet?

• The strength of the magnetic field increases.

• The strength of the magnetic field doesn't change.

• The strength of the magnetic field is doubled.

• The strength of the magnetic field decreases.

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Particles with opposite charges ____________ and particles with same (or like) charges ____________.

• attract, repel

• repel, repel

• attract, attract

• repel, attract

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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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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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Which of the following is not a good conductor?

• Copper

• Silver

• Aluminum

• Plastic

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NGSS.5-PS1-3

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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What does this image show?

• Parallel circuit

• Series circuit

• Magnet

• Electromagnet

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The area of magnetic force around a magnet is known as its ____________.

• magnetism

• magnetic current

• magnetic field

• electric current

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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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NGSS.3-PS2-3

What type of core is best for electromagnets?

• Steel

• Iron

• Plastic

• Copper

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