Unit 3 Pre-Test Magnetic Fields

1. Ramon puts two magnetic toy trains very close to each other on a track. What will happen next, and why?

• A. The trains will move closer to each other because like poles attract each other
• B. The trains will not move because the magnets are not touching.
• C. The trains will move away from each other because like poles repel each other
• D. The trains will move away from each other because the magnets are not touching.

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2. In a computer simulation, Jose moves a magnet (Magnet 2) toward another magnet (Magnet 1) that cannot move. What happens to the potential energy in the system of magnets?

• A. The potential energy does not change because the magnets in the system do not change.
• B. The potential energy increases because Magnet 2 moves against the magnetic force.
• C. The potential energy decreases because Magnet 2 moves against the magnetic force.
• D. The potential energy decreases because Magnet 2 moves in the same direction as the magnetic force.

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3. Based on the magnetic field line diagrams, what will happen next with these two sets of magnets?

• A. The magnets in Set 1 will repel, and the magnets in Set 2 will attract.
• B. The magnets in Set 1 will attract, and the magnets in Set 2 will repel.
• C. The magnets in Set 1 will not move, and the magnets in Set 2 will attract.
• D. In both sets, the magnets will attract.

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4. An engineer is investigating potential energy with two identical magnetic roller coaster cars on different sides of a center magnet that cannot move. To test her ideas, the engineer will move one car one space. Which movement will result in the largest increase in potential energy?

• A. Moving Car 1 one space toward the center magnet.
• B. Moving Car 2 one space away from the center magnet.
• C. Moving Car 2 one space toward the center magnet.
• D. All these movements will result in the same change in potential energy because they each move a roller coaster car the same distance.

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5. What does repel mean?

• To push away
• To pull together
• To be neutral
• To go against your parents

6. What does attract mean?

• To push away
• To pull together
• To be neutral
• To go against your parents

7. Liz moves a magnetic toy train away from a magnet that cannot move. What happens to the potential energy in the system of magnets during the movement?

• A. The potential energy decreases because the train moves in the same direction as the magnetic force.
• B. The potential energy decreases because the train moves against the magnetic force.
• C. The potential energy increases because the train moves against the magnetic force.
• D. The potential energy does not change because the magnets in the system do not change.

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8. What is a magnetic field?

• It is a place where they have a lot of magnets.
• The area surrounding a magnet in which the effect of magnetism is felt
• The area where only repulsive forces are felt
• A vector where only attractive forces are experience.

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9. Gravitational fields are always _____________.

• A. Repelling
• B. Attractive
• C. Conductive
• D. Passive

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10. The table below shows the magnitude of electromagnetic force exerted by two electromagnets on each other as the distance between the two electromagnets is varied. The data on the table provide evidence for which of the following conclusions?

• A. The force between any two magnets is always constant, regardless of distance.
• B. As distance between electromagnets increases, the electromagnetic force also increases.
• C. The smaller the distance between two electromagnets, the greater the force.
• D. The force between two magnets depends only on the charge of the electromagnets.

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