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# NCERT Solutions for Class 12 Physics, Chapter 5 - Magnetism and Matter

In this chapter, you’ll study about Magnetism and Matter. Magnetic fields are universal in nature. Our earth, our universe, and all other heavenly bodies are driven by some form of the magnetic field. The magnet was first discovered by the ancient Greeks who began observing the fact that magnetised pieces of mineral Magnetite were attracting iron.

Magnetism is the building up of attractive or repulsive forces between two objects that are magnetic in nature. It takes place due to the spin and orbital motions of electrons in atoms. Magnetism and matter are closely related; magnetism helps in understanding the nature and properties of various forms of matter.

It has several applications in our day to day lives such as working of credit cards, MRI machines, computers, speakers, televisions, in electric power, in treating cancer, vacuum cleaners, blenders and washing machines and the list just go on. In this chapter, you’ll study about bar magnet, magnetic field lines, the electrostatic analogue, Gauss’ Law and magnetism. You’ll also study about earth’s magnetism in detail, magnetic properties of materials like Diamagnetism, Paramagnetism and Ferromagnetism.

Thus, an in-depth study of Class 12 Physics NCERT Solutions Chapter 5 will give you a good understanding of magnetism and matter.

Let’s take a look at topics and sub-topics of Class 12 Physics Chapter 5 – Magnetism and Matter

5.1 Introduction

5.2 The Bar Magnet

5.2.1 The magnetic field lines

5.2.2 Bar magnet as an equivalent solenoid

5.2.3 The dipole in a uniform magnetic field

5.2.4 The electrostatic analog

5.3 Magnetism and Gauss’s Law

5.4 The Earth’s Magnetism

5.4.1 Magnetic declination and dip

5.5 Magnetisation and Magnetic Intensity

5.6 Magnetic Properties of Materials

5.6.1 Diamagnetism

5.6.2 Paramagnetism

5.6.3 Ferromagnetism

5.7 Permanent Magnets and Electromagnets

## In Class 12 Physics Chapter 5, you will learn -

Section 5.2 - In this section, you will study about the Bar Magnet, the magnetic field lines, bar magnet as an equivalent solenoid, the dipole in a uniform magnetic field and the electrostatic analog. You’ll also come across the properties of magnetic field lines and ways of plotting these.

Section 5.3 - In this section, you’ll acquire knowledge about magnetism and Gauss’s Law of magnetism, the difference between the Gauss’s Law of magnetism and that for electrostatics.

Section 5.4 – In this section, you’ll learn about earth’s magnetism, what is dynamo effect, north magnetic pole, south magnetic pole, north-seeking pole, a diagram showing the earth as a giant magnetic dipole. You’ll also study geographic meridian and magnetic meridian, magnetic declination, the element of the earth’s magnetic field, and more.

Section 5.5 – In this section, you will study Magnetisation and Magnetic Intensity. You’ll learn what is magnetisation M of a sample, magnetic susceptibility, and also the diamagnetic and magnetic permeability of the substance.

Section 5.6 – In this section, you will acquire knowledge about magnetic properties of materials, what are Diamagnetic and Paramagnetic substances, examples of such substances, what is Curie’s Law, what are Ferromagnetic substances and domains, what are hard magnetic materials or hard ferromagnets, soft ferromagnetic materials. Finally, you will learn about the Curie temperature in detail.

Section 5.7 – In this section, you’ll learn about permanent magnets and electromagnets, characteristics of permanent magnets, efficient ways to make permanent magnets, what is soft iron, where electromagnets are used and what are they made of.

In this chapter, you are provided with several examples with their solutions for a clear understanding of Magnetism and Matter. To know more about NCERT Solutions for Class 12 Physics Chapter 5, you should explore the exercises mentioned in this chapter. You can also download the NCERT Solutions for Class 12 Physics Chapter 5 PDF, solved by our science experts.

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