Magnetism and Electricity Quiz

The attractive force between two magnets increases. Which statement explains why this would happen?

• The like poles of the magnets are pointed at each other and move farther apart.

• The like poles of the magnets are pointed at each other and move closer together.

• The unlike poles of the magnets are pointed at each other and move farther apart.

• The unlike poles of the magnets are pointed at each other and move closer together.

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Which of the following BEST describes the relationship between magnetism and electricity in an electromagnet?

• electric currents prevent magnetic fields from forming

• magnets convert magnetic energy into electrical energy

• magnetic fields are created by the flow of electric currents

• electricity makes magnets attract nonmetals they normally cannot

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What will happen to a paper clip lying next to an electrically charged wire?

• it will heat up quickly

• it will be attracted to the wire

• it will be repelled by the wire

• nothing will happen to the paper clip

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Which of the following produces a magnetic field?

• heat moving through a wire

• heat moving through any metal

• electricity moving through a wire

• None of the above

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If the magnet in the picture is flipped so that the south pole is on the left, the magnetic _________. As the two magnets are moved closer together the magnetic force between them will become _________.

• attractive

• stronger

• weaker

• repulsive

• neutral

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The permanent magnet and the electromagnet pictured are equal in strength. How could the force between the two magnets be increased? Choose all that apply.

• The magnets could be moved closer together.

• The current in the electromagnet could be decreased.

• The permanent magnet could be turned around.

• The number of loops in the electromagnet could be increased.

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What happens to the magnetic field strength when the current in an electromagnet is increased?

• The magnetic field strength decreases

• The magnetic field strength remains the same

• The magnetic field strength increases

• The magnetic field strength becomes zero

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Which of the following materials can be magnetized?

• Plastic

• Wood

• Iron

• Glass

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What is the effect of increasing the number of coils in an electromagnet?

• The magnetic field becomes weaker

• The magnetic field becomes stronger

• The magnetic field remains unchanged

• The electromagnet stops working

Which of the following changes will increase the strength of an electromagnet?

• Decreasing the number of coils

• Increasing the resistance in the circuit

• Increasing the current flowing through the wire

• Using a non-metallic core

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