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

NCERT Solutions for Class 12 NCERT Solutions for Class 12 Physics 1. Electric Charges and Fields

NCERT Physics Part 1 Solutions for Class 12 Chapter 1- Electric Charges and Fields is provided here to help students in their preparation for the exam in an efficient manner. Solved by a team of experienced subject mentors, these NCERT Solutions are based in complete sync with the latest official CBSE syllabus. Further, containing all the set of detailed answers to the questions of the NCERT textbook, preparing for the board exams and scoring good marks is easy for the students.

In this Chapter, you will find the solved answers to the questions of the important topics like How to calculate forces between two charged particles which are kept at a distance from each other, the Reason behind the charging appearing in materials due to rubbing against each other. Apart from this, our NCERT Solutions covers the subtopics like Electric Current, Electric Field, Gauss’s Law, Continuous Charge Distribution, Coulomb’s Law etc.

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

Class 12th|NCERT - Physics Part-IChapter 1 - Electric Charges and Fields

Q. 1

What is the force between two small charged spheres having charges of 2 × 10^–7 C and 3 × 10^–7C placed 30 cm apart in air?

Q. 2

The electrostatic force on a small sphere of charge 0.4 μC due to another small sphere of charge –0.8 μC in air is 0.2 N.

(a) What is the distance between the two spheres? (b) What is the force on the second sphere due to the first?

Q. 3

Check that the ratio is dimensionless. Look up a Table of Physical Constants and determine the value of this ratio. What does the ratio signify?

Q. 4 A

Explain the meaning of the statement ‘electric charge of a body is quantised’.

Q. 4 B

Why can one ignore quantisation of electric charge when dealing with macroscopic i.e. large-scale charges?

Q. 5

When a glass rod is rubbed with a silk cloth, charges appear on both. A similar phenomenon is observed with many other pairs of bodies. Explain how this observation is consistent with the law of conservation of charge.

Q. 6

Four-point charges q_A = 2 μC, q_B = –5 μC, q_C = 2 μC, and q_D = –5 μC are located at the corners of a square ABCD of side 10 cm. What is the force on a charge of 1 μC placed at the centre of the square?

Q. 7 A

An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?

Q. 7 B

Explain why two field lines never cross each other at any point?

Q. 8

Two point charges q_A = 3 μ_C and q_B = –3 μ_C are located 20 cm apart in vacuum.

(a) What is the electric field at the midpoint O of the line AB joining the two charges?

(b) If a negative test charge of magnitude 1.5 × 10^–9 C is placed at this point, what is the force experienced by the test charge?

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NCERT - Physics Part-IClass 12th , NCERT

Chapter 1 - Electric Charges and Fields

Chapter 2 - Electrostatic Potential and Capacitance

Chapter 3 - Current Electricity

Chapter 4 - Moving Charges and Magnetism

Chapter 5 - Magnetism and Matter

Chapter 6 - Electromagnetic Induction

Chapter 7 - Alternating Current

Chapter 8 - Electromagnetic Waves

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