Coulomb's Law | Electrostatics | 01 | EduventureZ Complete Lecture for Class 12 IIT JEE MAINS NEET

Описание: Full Playlist of Coulomb’s Law:    • Class 12 Electric Field and Potential Full...  

Coulomb’s law states that Force exerted between two point charges:

Is inversely proportional to square of the distance between these charges and
Is directly proportional to product of magnitude of the two charges
Acts along the line joining the two point charges.
Forces between multiple charges –Superposition principle


Electric Field

Electric field is a force produced by a charge near its surroundings. This force is exerted on other charges when brought in the vicinity of this field.SI unit of electric field is N/C (Force/Charge).
Electric field due to a charge at a point is the force that a unit positive charge would experience if placed at that point.
The charge generating electric field is called source charge and the charge which experiences this field is called test charge. Practically, to keep source charge undisturbed due to the electric field of test charge, the test charge is kept infinitely small.
Since F(Force) is proportional to q (Charge), the electric field is independent of q but depends on r (space coordinates).
The electric field is symmetric in spherical coordinates.
The concept of Electric field is used to account for the time delay for a charged body to experience force from the field of a source charge.
Electric field due to system of charges

According to the superposition principle, the total electric field at a point in space is equal to the vector sum of individual fields present.

Electric Field Lines

Electric field lines are a pictorial way of representing electric field around a configuration of charges.


Electric field is inversely proportional to the square of the distance; hence electric field near the charge is high and keeps on decreasing as we go farther from the charge. The electric field lines, however, remain constant but are very far apart (at higher distances) as compared to lesser distance.
Electric Flux

Electric flux is the measure of flow of the electric field through a given area. Electric flux is proportional to the number of electric field lines going through a normally perpendicular surface.
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Electric charge,
Coulomb’s law,
Electric field,
Potential due to a point charge,
Potential due to a system of charges,
Relation between field and potential,
Electric dipole,
Electric flux,
Gauss’s law
What are the main topics in the chapter electrostatics in class 12?
Chapter 1 – Electronic Charges and Field

1. Coulomb’s Law

2. Forces between multiple charges electric field due to system of charges

3. Electric dipole’s electric field on axial and equatorial point

4. Electric dipole in external electric field

5. Gauss’s law application

Chapter 2 – Electrostatic Potential and Capacitance

1. Potential due to electric dipole and system of charges 2. Electric potential energy due to electric dipole and system of charges

3. Equipotential surfaces

4. Effect of dielectric on capacitors

5. Combinations of capacitors

6. Energy stored in capacitors

Chapter 3 – Current Electricity

1. Ohm’s Law

2. Limitations of ohm’s law

3. Resistivity of different materials

4. Combination of resistors

5. Combination of cells

6. Kirchhoff’s law

7. Meter bridge

8. Potentiometer