NCERT Solutions For Class 12 Physics Chapter 1: Electric Charges and Fields

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Content Strategy Manager

NCERT Solutions for Class 12 Physics Chapter 1 Electric charges and fields are provided in this article. Electric charge is the basic property of matter that causes it to experience a force when it is kept in an electric or a magnetic field. The electric field lines start from the positive charge and end on the negative charge.

The chapter is included in the unit Electrostatics which together with Current Electricity has a weightage of 17 marks in the CBSE Class 12 Physics Exam. The NCERT Solutions for Class 12 Physics Chapter 1 covers concepts of electric charge, conductors and insulators, Coulomb’s Law, electric field lines, Gauss’s law, and electric dipole.

Download PDF: NCERT Solutions for Class 12 Physics Chapter 1 Electric Charges and Fields

NCERT Solutions for Class 12 Physics Chapter 1

The NCERT Solutions for class 12 physics chapter 1 Electric Charges and fields are as given below –

Check out: Electric Charges and Fields MCQ

Important Topics of Electric Charges and Fields

Electric Charge refers to the property of subatomic particles that leads it to experience a force when it is placed in an electric and magnetic field.

Electric Charges are of two types – like charges and unlike charges

Like Charges repel each other.
Unlike Charges attract each other.

An electric charge has 3 fundamental properties – quantization, additive nature, and conservation of electric charge.

Quantization – The total charge of a body denotes the integral multiple of a basic quantum of charge.
Additive – This property represents the total charge of a body as an algebraic sum of all the singular charges that act on the system.
Conservation – This property expressed that the total charge of a system is not affected with time. Charges can neither be created nor destroyed.

Coulomb’s law states that mutual electrostatic force that exists between two point charges A and B is directly proportional to their product, AB and inversely proportional to the square of the distance between them.

F_e = \({kq_1q_2\over r^2}\)

Electric flux is the total number of electric field lines that pass through a given area in a unit of time.

The electric flux Δθ through an area element of ΔS can be denoted by

Δθ = E.ΔS = EΔScosθ

Conductors are the objects that assist in the movement of electric charge.
Insulators offer resistance to the flow of electricity through them.

Examples of Conductors – Human bodies, Earth, metal, etc.

Examples of Insulators – Nylon, Wood, Porcelain, etc.

Gauss law states that the total amount of electric flux that passes through a closed surface is directly proportional to the enclosed electric charge. The Gauss law formula is expressed by-

Φ = \({Q \over ϵo}\)

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Also Read:

Chapter 1 Related Articles
Applications of Gauss’s Law	Charging by Induction	Dipole in a Uniform External Field
Electric Dipole	Maxwell’s Equations	Cells, EMF and Internal Resistance
Kirchhoffs Laws	Electrostatics	Unit of Electric Field

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CBSE CLASS XII Related Questions

1.
A charge \( -6 \mu C \) is placed at the center B of a semicircle of radius 5 cm, as shown in the figure. An equal and opposite charge is placed at point D at a distance of 10 cm from B. A charge \( +5 \mu C \) is moved from point ‘C’ to point ‘A’ along the circumference. Calculate the work done on the charge.

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2.
Read the following paragraphs and answer the questions that follow.
A parallel plate capacitor consists of two conducting plates kept generally parallel to each other at a distance. When the capacitor is charged, the charge resides on the inner surfaces of the plates and an electric field is set up between them. Thus, electrostatic energy is stored in the capacitor.
The figure shows three large square metallic plates, each of side ‘L’, held parallel and equidistant from each other. The space between P1 and P2, and P2 and P3 is completely filled with mica sheets of dielectric constant ‘K’.
The plate P2 is connected to point A and the other plates P1 and P3 are connected to point B. Point A is maintained at a positive potential with respect to point B and the potential difference between A and B is V .

3.
Write the conditions under which two light waves originating from two coherent sources can interfere each other (i) constructively, and (ii) destructively, in terms of wavelength. Can these be applied for two lights originating from two sodium lamps? Give reason.

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4.
In the circuit, three ideal cells of e.m.f. \( V \), \( V \), and \( 2V \) are connected to a resistor of resistance \( R \), a capacitor of capacitance \( C \), and another resistor of resistance \( 2R \) as shown in the figure. In the steady state, find (i) the potential difference between P and Q, (ii) the potential difference across capacitor C.

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5.
Monochromatic light of green color is used in Young’s double slit experiment and an interference pattern is observed on a screen. If the green light is replaced by red monochromatic light of the same intensity, how will the fringe width of the interference pattern be affected? Justify your answer.

View Solution

6.
The figure shows the plot of magnitude of induced emf (\( \varepsilon \)) versus the rate of change of current in two coils ‘1’ and ‘2’. Which coil has a greater value of self-inductance and why?

View Solution

NCERT Solutions For Class 12 Physics Chapter 1: Electric Charges and Fields

NCERT Solutions for Class 12 Physics Chapter 1

Important Topics of Electric Charges and Fields

Previous Year Questions

CBSE CLASS XII Related Questions

3.
Write the conditions under which two light waves originating from two coherent sources can interfere each other (i) constructively, and (ii) destructively, in terms of wavelength. Can these be applied for two lights originating from two sodium lamps? Give reason.

6.
The figure shows the plot of magnitude of induced emf (\( \varepsilon \)) versus the rate of change of current in two coils ‘1’ and ‘2’. Which coil has a greater value of self-inductance and why?

Similar Physics Concepts

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NCERT Solutions For Class 12 Physics Chapter 1: Electric Charges and Fields

NCERT Solutions for Class 12 Physics Chapter 1

Important Topics of Electric Charges and Fields

Previous Year Questions

CBSE CLASS XII Related Questions

3.Write the conditions under which two light waves originating from two coherent sources can interfere each other (i) constructively, and (ii) destructively, in terms of wavelength. Can these be applied for two lights originating from two sodium lamps? Give reason.

6.The figure shows the plot of magnitude of induced emf (\( \varepsilon \)) versus the rate of change of current in two coils ‘1’ and ‘2’. Which coil has a greater value of self-inductance and why?

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

3.
Write the conditions under which two light waves originating from two coherent sources can interfere each other (i) constructively, and (ii) destructively, in terms of wavelength. Can these be applied for two lights originating from two sodium lamps? Give reason.

6.
The figure shows the plot of magnitude of induced emf (\( \varepsilon \)) versus the rate of change of current in two coils ‘1’ and ‘2’. Which coil has a greater value of self-inductance and why?