CBSE Class 12 Physics Notes, Free PDF download of CBSE Class 12 Physics revision notes and short key-notes to score more marks in your exams, prepared by our expert Physics teachers from the latest edition of CBSE (NCERT) books.

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Electric Charges and Fields Class 12 Notes CBSE Physics Chapter 1 (Free PDF Download)

Electric Charges and Fields Class 12 Notes CBSE Physics Chapter 1 NCERT(Free PDF Download)

Physics Class 12 Chapter 1: Electric Charges and Field - Notes

Physics Class 12 Chapter 1: Electric Charges and Field - Notes


Chapter 1 of CBSE Class 12 Physics, titled "Electric Charges and Fields," lays the foundation for understanding the fundamental concepts related to electric charges, their properties, and the electric field. In this blog, we will provide comprehensive notes summarizing the key points covered in this chapter.

1. Electric Charge:

- Electric charge is a fundamental property of matter. There are two types of charges: positive and negative.
- Like charges repel each other, while opposite charges attract.
- The charge on an electron is negative (-e), while the charge on a proton is positive (+e).

2. Coulomb's Law:

- Coulomb's law states that the force between two point charges is directly proportional to the product of their magnitudes and inversely proportional to the square of the distance between them.
- The formula for Coulomb's law is F = k * (q1 * q2) / r^2, where F is the force, q1 and q2 are the charges, r is the distance between them, and k is the electrostatic constant (9 x 10^9 Nm^2/C^2).

3. Electric Field:

- Electric field (E) is a region around a charged object where it exerts a force on other charged objects.
- Electric field intensity (E) at a point is the force experienced by a unit positive charge placed at that point.
- The formula for electric field intensity is E = F / q, where F is the force experienced and q is the test charge.

4. Electric Field Lines:

- Electric field lines are imaginary lines used to represent the electric field around a charged object.
- The direction of the electric field lines is the direction in which a positive test charge would move if placed in the field.
- Electric field lines never intersect, and their density indicates the strength of the electric field (closer lines represent stronger fields).

5. Electric Flux:

- Electric flux (Φ) represents the total number of electric field lines passing through a given surface.
- The formula for electric flux is Φ = E * A * cos(θ), where E is the electric field intensity, A is the area of the surface, and θ is the angle between the electric field and the surface normal.

6. Gauss's Law:

- Gauss's law relates the electric flux passing through a closed surface to the net charge enclosed by that surface.
- The mathematical expression of Gauss's law is Φ = q_enclosed / ε0, where Φ is the electric flux, q_enclosed is the net charge enclosed, and ε0 is the permittivity of free space (8.85 x 10^-12 C^2/Nm^2).


Understanding the concepts of electric charges and fields is essential for grasping the fundamentals of electromagnetism. The notes provided above summarize the key points covered in Chapter 1 of CBSE Class 12 Physics. It is important to revise these concepts thoroughly and practice solving numerical problems and conceptual questions to strengthen your understanding. Remember to consult your textbook, refer to additional study materials, and seek clarification from your teachers whenever necessary. Building a solid foundation in this chapter will pave the way for comprehending more complex concepts in the subsequent chapters of your physics course.

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