1. Which statement best describes the relationship between the distance from a magnet and the strength of its magnetic force?
- A. The magnetic force is constant regardless of the distance from the magnet.
- B. The magnetic force is strongest at a medium distance and weaker when very close or very far.
- C. The magnetic force decreases as the distance from the magnet increases.
- D. The magnetic force increases as the distance from the magnet increases.
2. If you slowly pull a small iron nail away from the pole of a strong magnet, what happens to the magnetic force the nail experiences?
- A. The force remains the same until the nail suddenly drops.
- B. The force on the nail becomes stronger.
- C. The force on the nail steadily weakens.
- D. The force switches from attraction to repulsion.
3. Where is a magnet's attractive force most concentrated and powerful?
- A. Evenly distributed throughout the entire magnet.
- B. In the area exactly at the center of the magnet.
- C. In the immediate vicinity of its poles.
- D. At a fixed distance of one inch away from its surface.
4. Which of the following best describes how the strength of a magnetic field changes as you move away from one of its poles?
- A. It decreases at a slow, constant rate.
- B. It remains at full strength for about a foot, then vanishes.
- C. It decreases rapidly at first, then more slowly.
- D. It fluctuates up and down unpredictably.
5. Imagine two identical magnets. Magnet 1 has an iron filing 2 cm from its north pole. Magnet 2 has an identical iron filing 6 cm from its north pole. How does the force on the filing near Magnet 1 compare to the force on the filing near Magnet 2?
- A. The force on the filing near Magnet 1 is weaker.
- B. The force is identical on both filings.
- C. The force on the filing near Magnet 1 is stronger.
- D. It is impossible to tell without knowing the magnet's material.
6. Why does it become increasingly difficult to push the north poles of two bar magnets toward each other?
- A. The magnets lose their magnetic properties when they are close together.
- B. The repulsive force between the magnets increases as the distance decreases.
- C. The attractive force begins to overcome the repulsive force at a short distance.
- D. The magnetic field weakens as the magnets get closer.
7. A student holds the north pole of one magnet near the south pole of another. What happens to the attractive force as the student slowly brings the magnets closer together?
- A. The force remains constant regardless of the distance.
- B. The force decreases until they touch.
- C. The force grows stronger, causing a sudden pull.
- D. The force switches from attraction to repulsion.
8. Consider two magnets with their south poles facing each other. At which point is the repulsive force between them the weakest?
- A. When they are 1 millimeter apart.
- B. When they are 2 centimeters apart.
- C. When they are 15 centimeters apart.
- D. The force is the same at all distances.
9. If you drop a small magnet onto a larger, fixed magnet with their like poles facing each other, what will likely happen as the small magnet gets very close to the large one?
- A. It will slow down, stop, and then be pushed upward by a strong repulsive force.
- B. It will accelerate downward and hit the large magnet with great force.
- C. It will flip over so its opposite pole faces down and then attract to the large magnet.
- D. It will stop in mid-air and remain perfectly still indefinitely.
10. Why does the interaction between two magnets change so dynamically as they are moved closer or farther apart?
- A. The force between them varies with distance.
- B. The magnets are gaining or losing electrons.
- C. The temperature of the magnets is changing.
- D. Earth's magnetic field interferes with the interaction.