Magnets Review

The diagram shows three bar magnets. The south and north poles have been labeled S and N on magnet A. The lines between each magnet show how iron filings line up when sprinkled around the magnets.

On the magnets shown, identify the missing magnetic poles that would allow the iron filings to line up.

• A is a S magnetic pole, B is a S magnetic pole, and C is a S magnetic pole.

• A is a S magnetic pole, B is a N magnetic pole, and C is a N magnetic pole.

• A is a N magnetic pole, B is a S magnetic pole, and C is a S magnetic pole.

• A is a N magnetic pole, B is a N magnetic pole, and C is a N magnetic pole.

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Letters A, B, C, and D represent locations on a bar magnet.

Which location has the greatest magnetic force?

• A

• B

• C

• D

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Magnets A and B are of equal magnetic strength. In which position will magnets A and B have the greatest attractive force toward each other?

• A

• B

• C

• D

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A bar magnet has a magnetic field in the region of space around it. The magnetic field is due to

• magnetic monopoles embedded in the metal.

• a hidden voltage source in the metal.

• the alignment of magnetic domains in the metal.

• an electric current that runs along the length of the magnet.

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Which position of two magnets results in the greatest repulsion between the magnets?

• A

• B

• C

• D

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When two ring magnets are placed on a pencil, magnet A remains suspended above magnet B, as shown below.

Which statement describes the gravitational force and the magnetic force acting on magnet A due to magnet B?

• The gravitational force is attractive and the magnetic force is repulsive.

• The gravitational force is repulsive and the magnetic force is attractive.

• Both the gravitational force and the magnetic force are attractive.

• Both the gravitational force and the magnetic force are repulsive.

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Which position on the bar magnet would have the strongest attraction to the north pole of another bar magnet?

• A

• B

• C

• D

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The diagram shows a metal paper clip attached to the base of a ring stand with a string. A magnet is attached to the ring stand with a clamp.

What would happen to the metal paper clip if the string were cut?

• The paper clip would drop.

• The paper clip would be forced to the right.

• The paper clip would hover.

• The paper clip would attract to the magnet.

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The diagram shows a bar magnet resting on top of a piece of white paper. The north and south poles of the magnet are labeled N and S. Points A, B, C, and D represent four locations around the magnet.

If iron filings were sprinkled evenly across the entire paper circle, at which location would the greatest concentration of iron filings be found after 30 seconds?

• A

• B

• C

• D

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The diagram shows four identical magnets that have been dipped into piles of shavings of four different metals.

Which statement explains the observations?

• Aluminum and copper attracted to the magnet because they contain magnetic domains.

• Nickel and cobalt attracted to the magnet because they contain magnetic domains.

• Aluminum and cobalt attracted to the magnet because they contain magnetic domains.

• Nickel and copper attracted to the magnet because they contain magnetic domains.

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