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

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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 = \({Q \over ϵo}\)

Previous Year Questions

The system will be in equilibrium if the value of q is…. [WBJEE 2016]
bulk modulus of a spherical object is subjected to uniform pressure, the the fractional radius will be.. [NEET 2017]
A hollow metal sphere of radius RR is uniformly charged. The electric field due to the sphere... [NEET 2019]
The equilibrium separation between the balls... [NEET 2013]
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When a soap bubble is charged ? [KCET 2020]

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 circular coil of 100 turns and radius \( \left(\frac{10}{\sqrt{\pi}}\right) \, \text{cm}\) carrying current of \( 5.0 \, \text{A} \) is suspended vertically in a uniform horizontal magnetic field of \( 2.0 \, \text{T} \). The field makes an angle \( 30^\circ \) with the normal to the coil. Calculate:
the magnetic dipole moment of the coil, and
the magnitude of the counter torque that must be applied to prevent the coil from turning.

View Solution

2.
Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of the Assertion (A).
Both Assertion (A) and Reason (R) are true, but Reason (R) is not the correct explanation of the Assertion (A).
Assertion (A) is true, but Reason (R) is false.
Both Assertion (A) and Reason (R) are false.

View Solution

3.
In a Young's double-slit experiment, two waves each of intensity I superpose each other and produce an interference pattern. Prove that the resultant intensities at maxima and minima are 4I and zero respectively.

View Solution

4.
The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:

\( \dfrac{3h}{2\pi} \)
\( \dfrac{2h}{\pi} \)
\( \dfrac{h}{\pi} \)
\( \dfrac{h}{2\pi} \)

View Solution

5.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

attract with a force \( \frac{F}{2} \)
repel with a force \( \frac{F}{2} \)
repel with a force \( F \)
attract with a force \( F \)

View Solution

6.
The figure represents the variation of the electric potential \( V \) at a point in a region of space as a function of its position along the x-axis. A charged particle will experience the maximum force at:

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

2.
Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

3.
In a Young's double-slit experiment, two waves each of intensity I superpose each other and produce an interference pattern. Prove that the resultant intensities at maxima and minima are 4I and zero respectively.

4.
The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:

5.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

6.
The figure represents the variation of the electric potential \( V \) at a point in a region of space as a function of its position along the x-axis. A charged particle will experience the maximum force at:

Similar Physics Concepts

Comments

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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

2.Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

3.In a Young's double-slit experiment, two waves each of intensity I superpose each other and produce an interference pattern. Prove that the resultant intensities at maxima and minima are 4I and zero respectively.

4.The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:

5.Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

6.The figure represents the variation of the electric potential \( V \) at a point in a region of space as a function of its position along the x-axis. A charged particle will experience the maximum force at:

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

2.
Assertion : Induced emf produced in a coil will be more when the magnetic flux linked with the coil is more. Reason (R): Induced emf produced is directly proportional to the magnetic flux.

3.
In a Young's double-slit experiment, two waves each of intensity I superpose each other and produce an interference pattern. Prove that the resultant intensities at maxima and minima are 4I and zero respectively.

4.
The energy of an electron in an orbit in hydrogen atom is \( -3.4 \, \text{eV} \). Its angular momentum in the orbit will be:

5.
Two small identical metallic balls having charges \( q \) and \( -2q \) are kept far at a separation \( r \). They are brought in contact and then separated at distance \( \frac{r}{2} \). Compared to the initial force \( F \), they will now:

6.
The figure represents the variation of the electric potential \( V \) at a point in a region of space as a function of its position along the x-axis. A charged particle will experience the maximum force at: