Class 12 NCERT Solutions for Physics Chapter 1

Class 12 Physics Chapter 1 NCERT Solutions – Electric Charge & Field

NCERT Class 12 Physics Chapter 1 is all about electric charges and electric fields. Physics is a vast subject with a lot of information yet to be explored and hence needs expertise and experience on the part of the teacher to impart that knowledge to the students. While classroom teaching covers a part of this knowledge transfer, the rest falls upon the students. To help students soak in this knowledge, Extramarks experts compiled the class 12 physics chapter 1 NCERT Solutions.

All the content related to Class 12 Physics Chapter 1 NCERT Solutions is available on Extramarks. The subject matter experts at Extramarks have created the solution sets based on their knowledge expertise and NCERT guidelines. Furthermore, all the questions listed in the NCERT Physics textbook have been answered here. In addition, all the solutions, syllabus, exemplars and important questions are available on Extramarks. 

NCERT Class 12 Physics Solutions – Other Related Chapters

Key Topics Covered In NCERT Solutions Class 12 Physics Chapter 1

Class 12 Physics Chapter 1 NCERT Solutions is based on Electric Charge and Field. Following are the key topics in this chapter. 

NCERT Solutions for Class 12 Physics Chapter 1 covers many concepts revolving around Electric charge and electric field. It also introduces electric field topics such as Flux, Dipole, and various laws like Gauss’Law, Coulomb’s Law. 

The weightage of the CBSE NCERT Solutions for Class 12 Physics Chapter 1 can help students score a maximum of 15 marks. If students face difficulties understanding the concepts or cannot figure out the solutions, they may log on to Extramarks to get expert guidance within minutes. 

Here’s detailed information on each subtopic in NCERT Solutions for Class 12 Physics Chapter 1 Electric Charges

1.2 Electric Charge

While exercise 1.1 gives a brief introduction to the chapter, exercise 1.2 of the NCERT Solutions for Class 12 Physics Chapter 1  gives more details on electric charge. The word “electricity” means “amber.” The magnetic and electric forces in materials, atoms, and molecules affect their characteristics. The word “electric charge” refers to the two types of entities.

According to an experiment, there are two types of electrification: (i) like charges repel one another, and (ii) different charges attract each other. The polarity of charge distinguishes between the two types of charges.

1.3 Conductors and Insulators:

During the conduction experiment, it was stated that conductors help in the flow of electric charge, but insulators do not. All types of metals, Earth, and Human Bodies are all conductors, but porcelain, nylon, and wood are all insulators, offering high resistance to the flow of electricity through them.

1.5 Basic Properties Of Electric Charge

There are three essential qualities of an electric charge mentioned under NCERT Solutions for Class 12 Physics Chapter 1.

• Charge – According to these characteristics, the total charge of a body indicates the integral multiple of a fundamental quantum of charge.
• Additive- This electric charge attribute reflects a body’s overall charge as the algebraic sum of all singular charges acting on the system.
• Conservation- According to conservation, the entire system’s charge remains unchanged. In other words, when things get charged due to friction, the charge is transferred from one item to another. Charges can neither be created nor destroyed.

1.6 Coulomb’s Law

Under this section of NCERT Solutions for Class 12 Physics Chapter 1, students learn about Coulomb’s Law. Coulomb’s law states that the mutual electrostatic force existing between two point charges A and B is proportional to their product AB and inversely proportional to the square of the distance between them. 

The equation is FAB = force on B due to A = k(AB) r2AB. 

The value of k is 9109Nm2C-2 and is termed a constant of proportionality. 

1.7 Multiple Charges and Their Forces

Coulomb’s law computes the mutual electric force between two charges. However, it cannot determine the force on a charge when several charges are present. An experiment has shown that the vector sum of all the forces on any charge owing to many other charges, taken one at a time, equals the vector sum of all the forces on that charge due to the other charges.

This section also talks about the Principles of Superposition: The property of two charges to repel and attract each other is unaffected by a third extra charge, according to the superposition principle. Students may refer to NCERT Solutions Class 12 Physics Chapter 1.7 to know more. 

1.10 Electric Flux

The wide variety of electrical area traces passing a given vicinity in a unit of time is described as the electrical flux. However, we notice that there’s no float of an observable bodily amount like withinside the case of liquid float. As per definition, Electric flux Δθ via a place detail ΔS is described by

Δθ= E.ΔS= E ΔS cosθ

This is proportional to the variety of area traces reducing the vicinity detail. The altitude θ is the altitude between E and ∆S. On a closed floor, where the conference is stated, θ is the altitude among E and the outward regular to the vicinity detail. To calculate the total flux via any given floor, divide the floor into small vicinity elements, calculate the flux at every point and sum them. Thus, the full flux θ via a floor S is θ ~ Σ E. ∆S. The usage of approximation image is because the electrical area E is to be steady over the small vicinity detail.

1.11 Electric Dipole

A couple of same or contrary fees A and -B are separated using distance 2x. The dipole second vector (let’s expect it as p) has an importance 2Ax and is within the dipole axis’s route from -B to A. To know more about Electric Dipole, students may refer to NCERT Solutions Class 12 Physics Chapter 1.11.

1.14 What is Gauss’Law?

According to the Gauss regulation, the overall flux related to a closed floor is 1/ε0 instances of the price enclosed using the closed floor.

E.ds=10q

For example, a factor price q is located inside a die of edge’ a’. As in keeping with Gauss regulation, the flux through every face of the die is q/6ε0.

The electric-powered subject is the simple idea to recognise approximately electricity. Generally, the electrical subject of the floor is calculated via means of making use of Coulomb’s regulation. However, to estimate the electrical subject distribution on a closed floor, we want to apprehend the idea of Gauss regulation. It explains the electrical price enclosed in a closed or the electrical price gift withinside the enclosed closed floor.

Gauss’ Law Formula

In keeping with the Gauss theorem, the overall price enclosed in a closed floor is proportional to the total flux enclosed using the floor. Therefore, if ϕ is overall flux and ϵ0 is electrical constant, the general electric powered price Q surrounded by way of means of the floor is: 

Q = ϕ ϵ0.

The Gauss regulation components are expressed by means of ϕ = Q/ϵ0.

Where,

Q = overall price on the given floor,

ε0 = the electrical constant.

For more information on the Gauss Law, students may access NCERT Solutions Class 12 Physics Chapter 1 on Extramarks.

The Gauss’ Theorem

The net flux through a closed floor is proportional to the net price within the quantity enclosed using the closed floor.

Φ = → E.d → A = qnet/ε0

In easy words, the Gauss theorem relates the ‘flow’ of electrical subject strains (flux) to the expenses on the enclosed floor. If there aren’t any expenses enclosed using a floor, then the net electric-powered flux stays zero. This approach shows that the quantity of electrical subject strains to come into the floor is the same as the sphere strains leaving the floor.

1.15 Applications of Gauss Law

Gauss Law is applied.

• For a charged ring with Radius R, which is located on-axis, at a distance x from the centre of the ring: 

E=140.qx(R2+x2)3/2

At the centre, x = zero and E = zero.

• In the case of a limitless price line, at a distance, ‘r’. E = (1/4 × πrε0) (2π/r) = λ/2πrε0. Where λ is the linear price density.
• The depth of the electrical subject close to an aircraft sheet of price is E = σ/2ε0K, wherein σ = floor price density.
• The depth of the electrical subject is close to an aircraft charged conductor E = σ/Kε0 in a medium of dielectric steady K. If the dielectric medium is air, then EAir = σ/ε0.
• The subject among parallel plates of a condenser is E = σ/ε0, wherein σ is the floor price density.

Students may click on the respective topics of the NCERT Solutions Class 12 Physics Chapter 1 in the table to access the study material provided by Extramarks.

NCERT Solutions for Class 12 Physics Chapter 1 Electric Charges and Fields NCERT Solutions Article Links

Click on the below links to view NCERT Solutions Class 12 Physics Chapter 1: 

• Class 12 Physics Chapter 1: Exercise 1.1 
• Class 12 Physics Chapter 1: Exercise 1.2 
• Class 12 Physics Chapter 1: Exercise 1.3 
• Class 12 Physics Chapter 1: Exercise 1.4 
• Class 12 Physics Chapter 1: Exercise 1.5 
• Class 12 Physics Chapter 1: Exercise 1.6 
• Class 12 Physics Chapter 1: Exercise 1.7 
• Class 12 Physics Chapter 1: Exercise 1.8 
• Class 12 Physics Chapter 1: Exercise 1.9 
• Class 12 Physics Chapter 1: Exercise 1.10 
• Class 12 Physics Chapter 1: Exercise 1.11 
• Class 12 Physics Chapter 1: Exercise 1.12 
• Class 12 Physics Chapter 1: Exercise 1.13 
• Class 12 Physics Chapter 1: Exercise 1.14 
• Class 12 Physics Chapter 1: Exercise 1.15 

Students may access NCERT Solutions Class 12 Physics Chapter 1 as well as other chapters by clicking here. In addition, students can also explore NCERT Solutions for other classes below.

• NCERT Solutions Class 1
• NCERT Solutions Class 2
• NCERT Solutions Class 3
• NCERT Solutions Class 4
• NCERT Solutions Class 5
• NCERT Solutions Class 6
• NCERT Solutions Class 7
• NCERT Solutions Class 8
• NCERT Solutions Class 9
• NCERT Solutions Class 10
• NCERT Solutions Class 11
• NCERT Solutions Class 12

By referring to Extramarks NCERT Solutions Class 12 Physics Chapter 1, students can easily understand Electric Charge and Field. In addition to Solutions, students may refer to past years’ question papers, important questions and revision notes on Extramarks.

Key Features of Class 12 Physics Ch 1 NCERT Solutions

Physics is an important subject for any competitive examinations like JEE or NEET. The subject cannot be memorised and needs a detailed approach to every problem. And hence students must study this subject by understanding the concepts well. NCERT Solutions Class 12 Physics Chapter 1 gives you in-depth knowledge about the subject and concepts to be studied. 

Students searching for Class 12 Physics Ch 1 NCERT Solutions can access it on Extramarks. Some of the major reasons you must choose Extramarks include

• The solutions are prepared by experts in the field of physics. 
• The Solution is as per the updated NCERT guidelines.
• All solutions are mentioned in a detailed and easy-to-understand manner.
• Every detail provided is framed considering the student’s learning capacity. 
• Students can score well through these explanatory NCERT Solutions Class 12 Physics Chapter 1 provided by Extramarks.