# CBSE Syllabus for Class 12 Physics Academic Year 2020-2021

## CBSE Syllabus for Class 12 Physics Academic Year 2020-2021

The CBSE class 12 board exam holds significant value as it serves as a reflection of one’s fundamental knowledge and academic abilities.

The syllabus for class 12 encompasses a diverse range of topics and fundamental concepts that students must thoroughly grasp to effectively tackle questions in both board exams and other competitive examinations.

## CBSE Class 12 Deleted Portion of Syllabus for 2020-2021

Check subject-wise details of the deducted portion of CBSE Class 9 syllabus from the following links:

### Physics Notes For Class 12 Chapter Wise

• Chapter 1 – Electric Charges And Fields
• Chapter 2 – Electrostatic Potential And Capacitance
• Chapter 3 – Current Electricity
• Chapter 4 – Moving Charges And Magnetism
• Chapter 5 – Magnetism And Matter
• Chapter 6 – Electromagnetic Induction
• Chapter 7 – Alternating Current
• Chapter 8 – Electromagnetic Waves
• Chapter 9 – Ray Optics and Optical Instruments
• Chapter 10 – Wave Optics
• Chapter 11 – Dual Nature Of Radiation And Matter
• Chapter 12 – Atoms
• Chapter 13 – Nuclei
• Chapter 14 – Semiconductor Electronics:Materials, Devices And Simple Circuits
• Chapter 15 – Communication Systems

Chapter 1 – Electric Charges And Fields

The origin of the word “electricity” can be traced back to the Greek word “elektron”, which means amber. The magnetic and electric forces present within matter, atoms, and molecules govern their properties. Furthermore, there are only two types of electric charges.

Chapter 2 – Electrostatic Potential And Capacitance

Electrostatic potential is a conservative external force that can be defined as the work done in moving a charge s from point r to point p. The potential difference between the initial and final points represents the difference in potential energy of the charges. The potential of a point is determined by the work done per unit charge when moving a charge from infinity to that point.

Chapter 3 – Current Electricity

Current refers to the amount of charge flowing through a particular area per unit time. To maintain a steady flow of current, it is essential to ensure that the circuit is closed, and an external source influences the electric charge, moving them from a lower to a higher potential energy level. The work done per unit charge to move the charge is known as the electromotive force or emf.

Chapter 4 – Moving Charges And Magnetism

A magnetic field is a physical phenomenon that arises from the presence of a magnet, an electric current, or a changing electric field. It is a vector field that exerts magnetic forces on charged particles that are in motion.

The magnetic field is generated by the intrinsic magnetic moments of elementary particles, which are associated with their spin, as well as by the motion of electric charges. The magnetic field and the electric field are intimately related and are both components of the electromagnetic force, which is one of the four fundamental forces of nature.

Chapter 6 – Electromagnetic Induction

Inductance can be defined as the ratio of the flux-linkage (represented by ε) to the current flowing through a conductor.

Chapter 7 – Alternating Current

In a circuit that involves Alternating Current, changes in current and electromotive force can be observed as a function of time.

Chapter 8 – Electromagnetic Waves

When there is a discrepancy between Ampere’s Law and observed behavior, the addition of an extra current is necessary to resolve the inconsistency. This extra current is known as the displacement current. The displacement current behaves as a source of the magnetic field, much like the conduction current.

Chapter 9 – Ray Optics and Optical Instruments

The laws of reflection and refraction are applicable to all surfaces and pairs of media at the point of incidence.

Chapter 10 – Wave Optics

Visible light, like all other forms of electromagnetic radiation, is made up of discrete packets of energy called photons. These photons possess the properties of both waves and particles, which is known as wave-particle duality. The branch of physics that deals with the study of light and its behavior is known as Optics.

Chapter 11 – Dual Nature Of Radiation And Matter

The photoelectric effect is the process in which electrons are emitted from the surface of a metal when it is illuminated by light of a certain frequency. This phenomenon involves the conversion of light energy into electrical energy and is subject to the law of conservation of energy. The photoelectric effect is an instantaneous process.

Chapter 12 – Atoms

Atoms are composed of equal numbers of positively charged protons and negatively charged electrons. In Thomson’s model, atoms were envisioned as a sphere with positive charges uniformly distributed throughout and electrons embedded within the sphere.

In Rutherford’s model, the atom was characterized as having a small, dense nucleus containing most of the atom’s mass and positive charge, with the electrons orbiting around it.

Chapter 13 – Nuclei

An atom is composed of a positively charged nucleus at its center, surrounded by negatively charged electrons in an electron cloud. The size of the atomic radius is much larger than that of the nucleus.

Most of the mass of an atom is concentrated in the nucleus, which contains protons and neutrons. Protons carry a positive charge while neutrons are neutral, but they both have the same mass. The protons and neutrons are held together by a strong nuclear force. Nuclear reactions involve far more energy than chemical reactions due to the significantly larger energy present in the nucleus.

Chapter 14 – Semiconductor Electronics:Materials, Devices And Simple Circuits

Semiconductors are essential materials used in solid-state electronic devices such as diodes and transistors. The atomic structure of a material determines whether it behaves as a metal, semiconductor or insulator. Semiconductor materials can be elements, such as silicon (Si) or germanium (Ge), or compounds such as cadmium sulfide (CdS) or gallium arsenide (GaAs).

Chapter 15 – Communication Systems

Electronic communication refers to the reliable and accurate transmission of information or data using electronic signals such as electrical current or voltage. These signals can travel over various media such as wires, cables, or through wireless channels.

The effectiveness of electronic communication largely depends on the quality of the medium used and the accuracy of the encoding and decoding of the message.

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