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Daily Practice Problems
Class 12 Physics
Electric Charges and Fields
daily practice problem

Question 1:

A point charge Q is placed at point O as shown in figure. Is the potential difference VA- VB positive, negative or zero; If Q is (i) positive (ii) negative

q+

  1. Positive, negative
  2. Negative, positive
  3. Positive, positive
  4. Negative, negative

 

Question 2:

8 dipoles of charges of magnitude ± e is placed inside a cube. What will be the total flux coming out of the cube?

  1. 0
  2. Α
  3. e
  4. -e

 

Question 3:

When air is replaced by a dielectric medium of dielectric constant K, the maximum force of attraction between two charges separated by a distance?

  1. Decreases k times
  2. Remains unchanged
  3. Increase k times
  4. Decreases k2 times

 

Question 4:

An electron is moving with a constant velocity v along X- axis enters a uniform electric field applied along Y-axis. Then the electron moves

  1. With uniform acceleration along Y-axis
  2. Without uniform acceleration along Y-axis
  3. In a trajectory represented as y= ax2
  4. In a trajectory represented as y=ax

 

Question 5:

An ideal electric dipole has

  1. Equal and similar charged separated by small distance.
  2. Unequal and opposite charges separated by large distance.
  3. Equal and opposite charges separated by negligibly small distance
  4. Equal and opposite charges separated by negligibly small distance.

 

Question 6:

The electric flux through the surface

  1. In fig. (iv) is the largest
  2. In fig. (iii) is the least
  3. In fig. (ii) is same as fig.(iii) but is smaller than fig.(iv)
  4. Is the same for all the figures.

 

Question 7:

Find the amount of work in rotating a dipole of dipole moment 3×10-3 cm from the position of stable equilibrium to the position od unstable equilibrium, in a uniform electric field of intensity 104 NC-1.

 

Question 8:

Two metal plates having a potential difference of 800 V are 0.02 m apart horizontally. A particle of mass 1.96 × 10-15 kg is suspended in equilibrium between the plates. If e is elementary charges, then charge on the particle is,

 

Question 9:

An α particle and a proton are accelerated at same potential difference from rest. Find the ratio of their velocities.

 

Question 10:

  1. An electrostatic field line is a continuous curve. That is, a field line cannot have sudden breaks. Why not?
  2. Explain why two field lines never cross each other at any point?

 

Question 11:

What is meant by the statement that the electric field of a point charge has spherical symmetry whereas that of an electric dipole is cylindrically symmetrical?

 

Question 12:

The electrostatic force of repulsion between two positively charged ions carrying equal charge is 3.7 × 10-9 N, when they are separated by a distance of 5Å . How many electrons are missing from each ion?

 

Question 13:

State and prove Gauss Theorem.

 

Question 14:

A particle of mass m carrying charge +q1 is revolving around a fixed -q2 in a circular path of radius r. Calculate the period of revolution.

 

Directions: These questions consist of two statements, each printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses.

(a) Both Assertion and Reason are correct and the Reason is a correct explanation of the Assertion.

(b) Both Assertion and Reason are correct but Reason is not a correct explanation of the Assertion.

(c) Assertion is correct, Reason is incorrect

(d) Assertion is incorrect and Reason is correct.

(e) Both assertion and reason are incorrect.

 

Question 15:

Assertion (A): A parallel plates charged capacitor is disconnected from a battery. Now if its plates are separated farther, the potential fall.

Reason (R): Energy stored in a capacity is equal to the work done in charging it.

 

Question 16:

Assertion: A uniformly charged ring behaves like a large charge if the point of observation is far away from the ring.

Reason: Electrostatic potential energy is maximum when the dipole is aligned parallel to the direction of Electric field.

 

Question 17:

Assertion: No work is done in moving a test charge between two points on an equilibrium surface.

Reason: Electric field acts normally to the equipotential surface.

 

Question 18:

Assertion: A lightning conductor at the top of high buildings are sharp pointed ends.

Reason: the surface charge density at sharp points is very high resulting in setting up of electric wind.

 

Question 19:

Assertion: An ebonite rod held in hand can be charged by rubbing with wool but copper rod cannot be charged like this.

Reason: Ebonite is good conductor of electricity, the charges so produced stay on ebonite rod.

 

Question 20:

Assertion: The tyres of aircrafts are slightly conducting.

Reason: If a conductor is connected to the ground, the extra charge induced on conductor will flow to the ground.

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Problem-solving on Class 12 Physics Electric Charges and Fields NCERT Chapter 1 after learning a theoretical concept is crucial for several reasons:

  1. Application of Knowledge: Problem-solving allows you to apply the theoretical concepts of the topic Class 12 Physics Electric Charges and Fields you have learned to real-life situations. It helps you bridge the gap between abstract knowledge and practical scenarios, making the learning more relevant and meaningful.
  2. Understanding Deeper Concepts: When you encounter problems related to a theoretical concept that you learned in Class 12 Physics Electric Charges and Fields NCERT Chapter 1, you are forced to delve deeper into its intricacies. This deeper understanding enhances your comprehension of the subject and strengthens your grasp of the underlying principles.
  3. Critical Thinking: Problem-solving encourages critical thinking and analytical skills. It requires you to analyze the problem, identify relevant information, and devise a logical solution. This process sharpens your mind and improves your ability to approach complex challenges effectively.
  4. Retention and Recall: Actively engaging in problem-solving reinforces your memory and improves long-term retention. Applying the concepts learned in Electric Charges and Fields Class 12 Physics in practical scenarios helps you remember them better than passive reading or memorization.
  5. Identifying Knowledge Gaps: When you attempt to solve problems, you may encounter areas where your understanding is lacking. These knowledge gaps become evident during problem-solving, and you can then focus on filling those gaps through further study and practice. You can refer Electric Charges and Fields Class 12 Physics Notes on LearnoHub.com
  6. Boosting Confidence: Successfully solving problems after learning a theoretical concept boosts your confidence in your abilities to handle Electric Charges and Fields. This confidence motivates you to tackle more challenging tasks and improves your overall performance in the subject.
  7. Preparation for Exams and Challenges: Many exams, especially in science, mathematics, and engineering, involve problem-solving tasks. Regular practice in problem-solving prepares you to face these exams with confidence and perform well. It is also advised to take tests on Electric Charges and Fields Class 12 Physics Online Tests at LearnoHub.com.
  8. Enhancing Creativity: Problem-solving often requires thinking outside the box and exploring various approaches. This fosters creativity and innovation, enabling you to come up with novel solutions to different problems.
  9. Life Skills Development: Problem-solving is a valuable life skill that extends beyond academics. It equips you with the ability to tackle various challenges you may encounter in personal and professional life.
  10. Improving Decision Making: Problem-solving involves making decisions based on available information and logical reasoning. Practicing problem-solving enhances your decision-making skills, making you more effective in making informed choices.

In summary, problem-solving after learning a theoretical concept on CBSE Electric Charges and Fields Class 12 Physics is an essential part of the learning process. It enhances your understanding, critical thinking abilities, and retention of knowledge. Moreover, it equips you with valuable skills that are applicable in academic, personal, and professional contexts.

You must have heard of the phrase “Practice makes a man perfect”. Well, not just a man, practice indeed enhances perfection of every individual.

Practicing questions plays a pivotal role in achieving excellence in exams. Just as the adage goes, "Practice makes perfect," dedicating time to solve a diverse range of exam-related questions yields manifold benefits. Firstly, practicing questions allows students to familiarize themselves with the exam format and types of problems they might encounter. This familiarity instills confidence, reducing anxiety and improving performance on the actual exam day. Secondly, continuous practice sharpens problem-solving skills and enhances critical thinking, enabling students to approach complex problems with clarity and efficiency. Thirdly, it aids in identifying weak areas, allowing students to focus their efforts on improving specific topics. Moreover, practice aids in memory retention, as active engagement with the material reinforces learning. Regular practice also hones time management skills, ensuring that students can allocate appropriate time to each question during the exam. Overall, practicing questions not only boosts exam performance but also instills a deeper understanding of the subject matter, fostering a holistic and effective learning experience.

All About Daily Practice Problems on Class 12 Physics Electric Charges and Fields NCERT Chapter 1

Our Daily Practice Problems (DPPs) offer a diverse range of question types, including Multiple Choice Questions (MCQs) as well as short and long answer types. These questions are categorized into Easy, Moderate, and Difficult levels, allowing students to gradually progress and challenge themselves accordingly. Additionally, comprehensive solutions are provided for each question, available for download in PDF format - Download pdf solutions as well as Download pdf Questions. This approach fosters a holistic learning experience, catering to different learning styles, promoting self-assessment, and improving problem-solving skills. With our well-structured DPPs, students can excel in exams while gaining a deeper understanding of the subject matter. Hope you found the content on Class 12 Physics Electric Charges and Fields NCERT Chapter 1 useful.

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