# Magnets And Magnetic Fields

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• 1.

### Which of the following statements correctly describes the behavior of magnets?

• A.

Like poles attract each other, and unlike poles repel each other.

• B.

Like poles repel each other, and unlike poles attract each other.

• C.

Both like and unlike poles can attract and repel each other depending on the surrounding materials.

• D.

None of the above

B. Like poles repel each other, and unlike poles attract each other.
Explanation
The correct answer states that like poles repel each other, and unlike poles attract each other. This is a fundamental principle of magnetism known as the law of magnetic poles. According to this law, two magnets with the same polarity (like poles) will push each other away, while two magnets with opposite polarities (unlike poles) will be attracted to each other. This behavior can be observed in everyday objects such as magnets on a refrigerator or in the operation of compasses.

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• 2.

### What do physicists call large groups of atoms whose net spins are aligned because of strong coupling between neighboring atoms?

• A.

Magnetic zones

• B.

Magnetic regions

• C.

Magnetic sectors

• D.

Magnetic domains

D. Magnetic domains
Explanation
Physicists refer to large groups of atoms whose net spins are aligned due to strong coupling between neighboring atoms as magnetic domains. In these domains, the magnetic moments of the atoms align in the same direction, creating a macroscopic magnetic field. This alignment occurs due to the exchange interaction between neighboring atoms, which leads to a cooperative behavior and the formation of magnetic domains.

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• 3.

### Which of the following statements about magnetic fields, B, is not true?

• A.

Magnetic fields are vector quantities.

• B.

Magnetic fields have both magnitude and direction.

• C.

Magnetic field strength increases as the distance from the magnetic source increases.

• D.

Magnetic fields are regions in which magnetic forces can be detected.

C. Magnetic field strength increases as the distance from the magnetic source increases.
• 4.

### How is the direction of a magnetic field, B, defined at any location?

• A.

The direction toward which the south pole of a compass needle points

• B.

The direction toward which the north pole of a compass needle points

• C.

The direction that is parallel to the imaginary magnetic field lines

• D.

The direction that is perpendicular to Earth’s magnetic field

B. The direction toward which the north pole of a compass needle points
Explanation
The direction toward which the north pole of a compass needle points is used to define the direction of a magnetic field at any location.

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• 5.

### What describes  ΦM?

• A.

Magnetic flux

• B.

The number of field lines that cross a certain area

• C.

ABcosθ

• D.

All of the above

D. All of the above
Explanation
The correct answer is "all of the above". This means that all the options listed - magnetic flux, the number of field lines that cross a certain area, and ABcosθ - describe ΦM.

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• 6.

### Since more magnetic field lines cross the area that is near the pole of a magnet, what does this indicate about the magnetic field strength in that location?

• A.

It is stronger.

• B.

It is weaker.

• C.

It is entering the magnet.

• D.

It is leaving the magnet.

A. It is stronger.
Explanation
The fact that more magnetic field lines cross the area near the pole of a magnet indicates that the magnetic field strength in that location is stronger. This is because the density of magnetic field lines represents the intensity or strength of the magnetic field. Therefore, the higher concentration of field lines near the pole suggests a stronger magnetic field in that region.

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• 7.

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

• A.

Magnetic field lines form open or closed loops.

• B.

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

• C.

Magnetic field lines have no beginning or end.

• D.

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

A. Magnetic field lines form open or closed loops.
Explanation
The statement "Magnetic field lines form open or closed loops" is not true because magnetic field lines are always closed loops. They form closed loops around a magnet, with the lines emerging from the north pole and re-entering at the south pole. This is a fundamental property of magnetic field lines and is a key concept in understanding the behavior of magnets and magnetic fields.

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• 8.

### Which of the following statements about the orientation and effects of Earth’s magnetic field is not true?

• A.

The geographic North Pole of Earth is near the magnetic south pole.

• B.

A compass needle that can rotate both perpendicularly and parallel to the surface of Earth, points down at the magnetic south pole.

• C.

A compass needle always indicates the direction of true north.

• D.

The geographic South Pole of Earth corresponds to the magnetic north pole.

C. A compass needle always indicates the direction of true north.
Explanation
A compass needle does not always indicate the direction of true north. This is because the Earth's magnetic field is not aligned exactly with the geographic north pole. The magnetic north pole and true north pole are located at different points on Earth's surface, so a compass needle will point towards magnetic north instead of true north.

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• Jun 25, 2024
Quiz Edited by
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• Apr 02, 2011
Quiz Created by
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