# Exam 8 Target 7 Retake Preap

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• 1.

### Which of the following situations is true for magnets?

• A.

A. Like poles repel each other.

• B.

B. Unlike poles repel each other.

• C.

C. North poles repel each other.

• D.

D. A north pole and a south pole will attract each other.

B. B. Unlike poles repel each other.
Explanation
Unlike poles repel each other because magnets have two poles, a north pole and a south pole. According to the law of magnetism, opposite poles attract each other while like poles repel each other. This is due to the alignment of the magnetic field lines. When two magnets with opposite poles are brought close to each other, the magnetic field lines interact and cause a force of attraction. On the other hand, when two magnets with like poles are brought close, the magnetic field lines repel each other, resulting in a force of repulsion. Therefore, the correct statement is that unlike poles repel each other.

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• 2.

### Where is the magnitude of the magnetic field around a permanent magnet greatest?

• A.

A. close to the poles

• B.

B. far from the poles

• C.

C. The magnitude is equal at all points on the field.

• D.

D. The magnitude depends on the material of the magnet.

A. A. close to the poles
Explanation
The magnitude of the magnetic field around a permanent magnet is greatest close to the poles. This is because the magnetic field lines are more concentrated and closer together near the poles, resulting in a higher magnitude of the magnetic field. As you move away from the poles, the field lines spread out and become less concentrated, causing the magnitude of the magnetic field to decrease.

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• 3.

### All of the following statements about magnetic field lines around a permanent magnet are true which one?

• A.

A. Magnetic field lines appear to end at the north pole of a magnet.

• B.

B. Magnetic field lines have no beginning or end.

• C.

C. Magnetic field lines always form a closed loop.

• D.

D. In a permanent magnet, the field lines actually continue within the magnet itself.

A. A. Magnetic field lines appear to end at the north pole of a magnet.
Explanation
The correct answer is a. Magnetic field lines appear to end at the north pole of a magnet. This is because the magnetic field lines are a representation of the direction and strength of the magnetic field. They are drawn from the north pole to the south pole of a magnet, indicating the flow of the magnetic field. At the north pole, the field lines appear to end because they are entering the magnet. Similarly, at the south pole, the field lines appear to originate because they are exiting the magnet.

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• 4.

### Which compass needle orientation in the figure on the right might correctly describe the magnet’s field at that point?

• A.

a. a

• B.

b. b

• C.

c. c

• D.

d. d

A. a. a
Explanation
The correct answer is a. The orientation of the compass needle in option a matches the direction of the magnetic field at that point. This can be determined by observing the alignment of the needle with the field lines in the figure.

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• 5.

### Which of the following statements about magnetic field lines is not true?

• A.

A. Magnetic field lines have no beginning or end.

• B.

B. Magnetic field lines form open or closed loops.

• C.

C. Magnetic field lines appear to begin at the north pole of a magnet.

• D.

D. Magnetic field lines appear to end at the south pole of a magnet.

B. B. Magnetic field lines form open or closed loops.
Explanation
Magnetic field lines do not form open or closed loops. Instead, they always form closed loops, starting from the north pole and ending at the south pole of a magnet. This is a fundamental property of magnetic field lines and is a key concept in understanding the behavior of magnets and their interactions with other objects.

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• Current Version
• Sep 07, 2023
Quiz Edited by
ProProfs Editorial Team
• Dec 09, 2015
Quiz Created by
Sfduke