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# NCERT Solutions for Class 12 Physics, Chapter 4 - Moving Charges and Magnetism

In this chapter, you’ll study about moving charges and magnetism. It is interesting to know that both magnetism and electricity are related to each other. Their relation was first noticed by a Danish physicist, Hans Christian Oersted in 1820. You’ll learn about magnetic force, sources and fields, what is the Lorentz force, motion in a magnetic field, what is velocity sector and cyclotron, how does magnetic field occur because of current element, what is Biot-Savart Law, magnetic field on the axis of a circular current loop, what is Ampere’s Circuital Law, the Solenoid and the Toroid, what is meant by Torque on Current Loop, Magnetic Dipole and the Moving Coil Galvanometer.

Thus, an in-depth study of Class 12 Physics NCERT Solutions Chapter 4 will give you a good understanding of moving charges and magnetism.

Let’s take a look at topics and sub-topics of Class 12 Physics Chapter 4– Moving Charges and Magnetism

4.1 Introduction

4.2 Magnetic Force

4.2.1 Sources and fields

4.2.2 Magnetic Field, Lorentz Force

4.2.3 Magnetic force on a current-carrying conductor

4.3 Motion in a Magnetic Field

4.4 Motion in Combined Electric and Magnetic Fields

4.4.1 Velocity selector

4.4.2 Cyclotron

4.5 Magnetic Field due to a Current Element, Biot-Savart Law

4.6 Magnetic Field on the Axis of a Circular Current Loop

4.7 Ampere’s Circuital Law

4.8 The Solenoid and the Toroid

4.8.1 The solenoid

4.8.2 The toroid

4.9 Force between Two Parallel Currents, the Ampere

4.10 Torque on Current Loop, Magnetic Dipole

4.10.1 Torque on a rectangular current loop in a uniform magnetic field

4.10.2 Circular current loop as a magnetic dipole

4.10.3 The magnetic dipole moment of a revolving electron

4.11 The Moving Coil Galvanometer

## In Class 12 Physics Chapter 4, you will learn –

Section 4.2 - In this section, you will study about magnetic force, two stages in the interaction of two charges, the principle of superposition, what is Lorentz force, features of the magnetic field and magnetic force, the magnetic force on a current-carrying conductor, and more.

Section 4.3 - In this section, you’ll learn about motion in a magnetic field, a diagram showing circular and helical motion and learn about the radius of the helix.

Section 4.4 – In this section, you’ll acquire knowledge about motion in combined electric and magnetic fields, velocity selector, cyclotron, resonance condition and a schematic sketch of the cyclotron.

Section 4.5 – In this section, you’ll study about Biot-Savart Law and its illustration. You’ll also come across some similarities as well as differences between the Biot-Savart law and the Coulomb’s law for the electrostatic field.

Section 4.6 – In this section, you will acquire knowledge about the Biot-Savart law to calculate the magnetic field due to a circular loop. You’ll also evaluate the magnetic field due to a circular coil along its axis and study the right-hand thumb rule.

Section 4.7 - In this section, you will learn about Ampere’s circuital law in detail with diagrammatic representation. You’ll also study what is cylindrical symmetry, magnetic field lines and more.

Section 4.8 - In this section, you’ll study about the solenoid and the toroid – two pieces of equipment generating magnetic fields, diagrammatic representation and applications of a solenoid and a toroid.

Section 4.9 - In this section, you will study about Force between Two Parallel Currents, the Ampere, and diagram showing two long straight parallel conductors carrying steady currents. You’ll also study the law of ‘Parallel currents attract, and antiparallel currents repel’ in detail.

Section 4.10 - In this section, you’ll acquire knowledge about Torque on current loop, Magnetic Dipole, Torque on a rectangular current loop in a uniform magnetic field, Circular current loop as a magnetic dipole and the magnetic dipole moment of a revolving electron. You’ll also learn what orbital magnetic moment is; spin magnetic moment, intrinsic magnetic moment, Bohr magneton, what is the Bohr quantisation condition and gyromagnetic ratio.

Section 4.11 - In this section, you’ll acquire knowledge about the Moving Coil Galvanometer, what does the galvanometer consist of and the diagram showing the Moving Coil Galvanometer. You’ll further learn what shunt resistance is, current sensitivity of galvanometer, and more.

In this chapter, you are provided with several examples with their solutions for a clear understanding of Moving Charges and Magnetism. To know more about NCERT Solutions for Class 12 Physics Chapter 4, you should explore the exercises mentioned in this chapter. You can also download the NCERT Solutions for Class 12 Physics Chapter 4 PDF, solved by our science experts.

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