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

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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 student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.
The electron drift speed is estimated to be only a few mm/s for currents in the range of a few amperes. How, then, is the current established almost the instant a circuit is closed ?

View Solution

3.
An inductor of \(\frac{5}{\pi}\,H\), a capacitor of \(\frac{50}{\pi}\,\mu F\) and a resistor of \(400\,\Omega\) are connected in series across an ac voltage \[ v = 140 \sin(100\pi t)\,V. \] Calculate:
• (I) impedance of the circuit
• (II) rms value of current in the circuit} (Take \(\sqrt{2}=1.4\))

View Solution

4.
Obtain an expression for the work done to dissociate the system of three charges \(q\), \(-4q\) and \(2q\) placed at the vertices A, B and C respectively of an equilateral triangle of side \(a\).

View Solution

5.
A low voltage supply from which one needs high currents must have very low internal resistance. Why ?

View Solution

6.
Explain the potential difference between the plates of a charged parallel plate capacitor decreases when its plates are brought closer.

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

1.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.
The electron drift speed is estimated to be only a few mm/s for currents in the range of a few amperes. How, then, is the current established almost the instant a circuit is closed ?

4.
Obtain an expression for the work done to dissociate the system of three charges \(q\), \(-4q\) and \(2q\) placed at the vertices A, B and C respectively of an equilateral triangle of side \(a\).

5.
A low voltage supply from which one needs high currents must have very low internal resistance. Why ?

6.
Explain the potential difference between the plates of a charged parallel plate capacitor decreases when its plates are brought closer.

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

1.A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.The electron drift speed is estimated to be only a few mm/s for currents in the range of a few amperes. How, then, is the current established almost the instant a circuit is closed ?

4.Obtain an expression for the work done to dissociate the system of three charges \(q\), \(-4q\) and \(2q\) placed at the vertices A, B and C respectively of an equilateral triangle of side \(a\).

5.A low voltage supply from which one needs high currents must have very low internal resistance. Why ?

6.Explain the potential difference between the plates of a charged parallel plate capacitor decreases when its plates are brought closer.

Similar Physics Concepts

Comments

SUBSCRIBE TO OUR NEWS LETTER

1.
A student sets up the circuit as shown in the figure to find the value of unknown resistance X and records a set of readings of the voltmeter and the ammeter by using the rheostat.

2.
The electron drift speed is estimated to be only a few mm/s for currents in the range of a few amperes. How, then, is the current established almost the instant a circuit is closed ?

4.
Obtain an expression for the work done to dissociate the system of three charges \(q\), \(-4q\) and \(2q\) placed at the vertices A, B and C respectively of an equilateral triangle of side \(a\).

5.
A low voltage supply from which one needs high currents must have very low internal resistance. Why ?

6.
Explain the potential difference between the plates of a charged parallel plate capacitor decreases when its plates are brought closer.