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  • Last Modified 24-05-2023

NCERT Solutions for Class 12 Physics Chapter 7 Alternating Current


In this article, students can find the NCERT solutions for their Class 12 Board Physics chapter 7- Alternating Current. It is not just important to score good marks in Board exams but also a vital chapter for the entrance exams. Hence, it is important to be thorough with these concepts to score well in the exams. Practising NCERT questions will help students understand the correct approach to answering questions in exams.

CBSE Class 6 Chapter 11 talks about AC Voltage Applied to a Resistor, Power in a Purely Resistive Circuit, The Average Value of a Sinusoidal Function, The Average Value of the Square of Cosine and Sine Function, Root Mean Square of Alternating Current and many more. Embibe offers a set of 400+ practice questions for all the sub-topics involved in Chapter 7. Students must practice the in-text questions provided by Embibe to perform well in the exams. Keep reading this article to know NCERT Solutions for Class 12 Chapter 7 Physics.

Explore Study Material for CBSE Class 12 Physics Chapter 1 Here

NCERT Solutions for Class 12 Physics Chapter 7: Important Topics

NCERT Solutions for Class 12 Physics Chapter 7 are interesting to solve. Students who regularly practice the questions and follow the concepts can easily solve the problems. To make the learning easy, students must go through the NCERT Class 12 Physics Chapter 7 learning videos provided by Embibe. As the students keep practising the questions, they will develop speed and accuracy to solve problems.
Embibe delivers solutions to all the questions in the CBSE Class 12 Physics Chapter 7 textbook by considering the latest syllabus. Also, the solutions are provided free for the students to practice at Embibe and achieve good scores. Embibe also provides free NCERT 3D Videos, NCERT Exemplars, Embibe Explainers, etc.
We have provided the topics included in CBSE Class 12 Physics Chapter 7 below:

Sl. No. Topic Name
1AC Voltage Applied to a Resistor
2Representation of AC Current and Voltage
3AC Voltage Applied to an Inductor
4AC Voltage Applied to a Capacitor
5AC Voltage Applied to a Series LCR Circuit
7Power in AC Circuits
9LC Oscillations

NCERT Solutions for Class 12 Physics Chapter 7: Points To Remember

Below are some important points from Chapter 7 of Class 12 Physics.

  • Phasor: A phasor is a vector which rotates about the origin with angular speed ω. The magnitude of a phasor represents the amplitude or peak value of the quantity (voltage or current) represented by the phasor.
  • LC Oscillation: A circuit containing an inductor L and a capacitor C (initially charged) with no ac source and no resistors exhibit free oscillations. The energy in the system oscillates between the capacitor and the inductor, but their sum or the total energy is constant in time.
  • Transformer: If the secondary coil has a greater number of turns than the primary, the voltage is stepped-up (Vs>Vp) This type of arrangement is called a step-up transformer. If the secondary coil has turned less than the primary, we have a step-down transformer.
  • Resonance: An interesting characteristic of a series RLC circuit is the phenomenon of resonance. The circuit exhibits resonance, i.e., the amplitude of the current is maximum at the resonant frequency, ω0=1LC√.
  • AC Voltage Applied to a Resistor: An alternating voltage v=vm sinωt applied to a resistor R drives a current i=im sinωt in the resistor, im=vmR. The current is in phase with the applied voltage.
  • (ii) For an alternating current i=im sinωti=im sin⁡ωt passing through a resistor  R R, the average power loss PP (averaged over a cycle) due to joule heating is (12)i2mR12im2R.

NCERT Solutions for Class 12 Physics: All Chapters

Students can find the detailed NCERT Class 12 Physics solutions provided below for quick reference:

Class 12 Physics Chapters
Electric Fields and Charge Electrostatic Potential and Capacitance
Current Electricity Moving Charges and Magnetism
Magnetism and Matter Electromagnetic Induction
Alternating Current Electromagnetic Waves
Ray Optics and Optical Instruments Wave Optics
The Dual Nature of Radiation and Matter Atoms
Nuclei Semiconductor Electronics

Explore CBSE Class 12

CBSE Class 12 Physics Chapter wise Questions with AnswerCBSE Class 12 Physics Marking Scheme
CBSE Class 12 Physics NotesClass 12 Physics Syllabus CBSE
Physics Sample Papers for CBSE Class 12Best NCERT Books of Physics for Class 12
CBSE NCERT Solutions for Class 12 PhysicsCBSE NCERT Solutions for Class 12 Biology
CBSE NCERT Solutions for Class 12 ChemistryCBSE NCERT Solutions for Class 12 Maths

FAQs on NCERT Solutions for Class 12 Physics Chapter 7

Below are some of the most frequently asked questions on NCERT Solutions for Class 12 Physics chapter 7:

Q. Why should I practice NCERT questions and refer to their solutions?

Ans: NCERT questions help students get a clear idea of the kind of questions that they should expect in their Board examinations. The solution sets will guide them to understand the correct approach to be followed to answer the questions.

Q. Are the NCERT solutions provided here as per the CBSE guidelines?

Ans: All the NCERT solutions are created by Embibe’s academic expert team and are strictly based on the CBSE guidelines.

Q. What is the level of NCERT questions? Is it good enough for competitive exams?

Ans: The NCERT questions demand one to have a good knowledge of the basics. It will be enough for the school or Board exam. But it might not be sufficient for JEE Main, NEET, and other entrance exams for engineering and medical.

Q. Can I skip NCERT questions and just refer to example problems?

Ans: No, students should not do that. Students may think that there is no need to practice NCERT questions, but they solve the NCERT questions to score well.

Q. Shall I directly start referring to NCERT solutions and then understand the concept?

Ans: No, it is essential that a student first reads and understands the concepts and then proceeds to solve questions. If students get stuck while solving the NCERT questions, they can refer to NCERT solutions.

We hope this article on NCERT Solutions for Class 12 Physics Chapter 8 was helpful to you. Stay tuned to Embibe for the latest updates on the Class 12 exam.

Adaptive Practice with Solutions To Help You Ace Important Topics for 12th NCERT Physics