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id: "66dfe0533f8b4e9e69bf80be"
title: "MAGNETISM AND MATTER"
board: "CBSE"
curriculum: "CBSE"
class: "Class 12"
subject: "Physics"
book: "Physics Part - I"
chapter: "MAGNETISM AND MATTER"
chapter_slug: "magnetism-and-matter"
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last_updated: "2026-06-22"
---

# MAGNETISM AND MATTER
Magnetic phenomena are universal in nature and are present in everything from distant galaxies to tiny atoms. This chapter explores the subject of magnetism, its properties, and its applications, focusing on various types of magnets and their classifications.

---

## Knowledge Snapshot
| Field | Details |
| :--- | :--- |
| Class | Class 12 |
| Subject | Physics |
| Book | Physics Part - I |
| Chapter | MAGNETISM AND MATTER |
| Pages | 136-153 |

---

## Chapter Summary
### Short Summary
This chapter discusses the fundamental principles of magnetism, including the behavior of magnets, Earth's magnetic field, and the classification of materials based on their magnetic properties.

### Detailed Summary
Magnetic phenomena, which have existed since long before human evolution, are due to magnetic fields generated by various sources. The term "magnet" originates from the region of Magnesia in Greece, known for its magnetic ore. Key ideas include the Earth's magnetic field, the behavior of bar magnets, and the nature of magnetic forces. It is noted that like poles repel while opposite poles attract, and that magnetic monopoles do not exist. Materials can be categorized based on their magnetic properties, including paramagnetism, diamagnetism, and ferromagnetism.

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## Topic-Wise Explanation
### INTRODUCTION
Magnetism is effective universally, affecting everything from galaxies to individual atoms. The Earth's magnetism has existed before humans, with the notion of magnets linked to the Greek island of Magnesia.

### BAR MAGNET
A bar magnet, when suspended freely, aligns itself in the north-south direction. The ends that point north and south are termed the north and south poles, respectively.

### MAGNETISM AND GAUSS’S LAW
Gauss's law of magnetism describes how magnetic fields interact with charges and currents. It defines the concept of magnetic fields as related to their sources.

### MAGNETISATION AND MAGNETIC INTENSITY
This section explains how materials can become magnetized and the intensity of the magnetization process.

### MAGNETIC PROPERTIES OF MATERIALS
Materials are classified into different categories based on their magnetic properties like ferromagnetism, paramagnetism, and diamagnetism.

---

## Core Ideas
| Idea | Explanation |
| :--- | :--- |
| Earth’s Magnetism | Earth's magnetic field points from geographic south to north. |
| Bar Magnet Behavior | A bar magnet points north-south when freely suspended. |
| Magnetic Forces | Similar poles repel, and opposite poles attract. |
| Magnetic Monopoles | Isolated north or south poles do not exist. |
| Material Classification | Magnetic properties categorize materials into para-, dia-, and ferromagnetism. |

---

## Key Concepts
| Concept | Meaning |
| :--- | :--- |
| Magnet | An object that produces a magnetic field. |
| Magnetic Field | The area around a magnet where magnetic forces are exerted. |
| Magnetic Pole | Each magnet has a north and south pole where the magnetic force is strongest. |

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## Important Points for Revision
* Magnetic phenomena span the universe.
* The term "magnet" comes from Magnesia.
* The Earth’s magnetic field has existed long before humans.
* Bar magnets align with the earth's magnetic field.
* Like poles repel, opposite poles attract.
* Magnetic monopoles do not exist.
* Materials can be magnetized.
* Classification of magnetic materials: para-, dia-, and ferromagnetic.

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## Practice Questions
### Short Answer Questions
1. What is magnetism?
2. Describe the Earth's magnetic field.
3. What is a bar magnet?
4. Explain the concept of magnetic poles.
5. Describe the interaction between like and opposite poles.

### Long Answer Questions
1. Discuss Gauss’s law of magnetism.
2. Explain how magnets can be made from iron and its alloys.
3. Describe the types of magnetic properties classified in materials.

---

## Related Concepts
- Ferromagnetism
- Paramagnetism
- Diamagnetism

---

## Source Attribution
| Field | Value |
| :--- | :--- |
| Source | Edzy |
| Reference Type | examSubjectBookChapter |
| Reference ID | 66dfe0533f8b4e9e69bf80be |
| Canonical URL | https://www.edzy.ai/cbse-class-12-physics-physics-part-i-magnetism-and-matter |
| Markdown URL | https://www.edzy.ai/okf/chapter/cbse-class-12-physics-physics-part-i-magnetism-and-matter.md |