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# NCERT Exemplar Class 12 Physics Chapter 7 Solutions: Alternating Current

NCERT Exemplar Class 12 Physics Solutions Chapter 7 – Alternating Current is a perfect guide for you to cope up with the problems in NCERT Exemplar Book. Whenever in doubt, you can refer to our NCERT Exemplar Solutions. You will get well versed with topics like AC voltage, an alternate current voltage applied to a capacitor, AC application to a resistor, and so on.

There are a total of 26 questions in NCERT Exemplar Class 12 Physics Chapter 7. The questions have been categorised as MCQs, very short answers or VSA, short answers or SA and long answers or LA. These Exemplar questions and their solutions are designed as such, that you can understand all the fundamental concepts very well. Practising these questions will give you a clear idea of the entire chapter.

NCERT Exemplar Class 12 Physics problems and solutions for chapter 7 – Alternating Current has been prepared by Instasolv experts. The solutions are as per the guidelines of CBSE. The high aptitude problems in NCERT Exemplar book can be quite overwhelming sometimes. You may find it challenging to solve the questions all by yourself. But with Instasolv’s NCERT Exemplar Solutions for Chapter 7, you can keep on practising at your own pace. The solutions are self-sufficient in themselves for you to learn and understand the Chapter 7.

## Important topics for NCERT Exemplar Class 12 Physics Solutions Chapter 7

There are different concepts and topics covered in NCERT Exemplar Class 12 Solutions of Physics Chapter 7 – Alternating Current. Let’s have a look:

• Alternating current: This is the current whose magnitude alters with time and direction gets reversed periodically.
• Values of alternating current and voltage:
1. Peak value: The NCERT Exemplar problems with solutions for class 12 chapter 7 Physics lets you know that the peak value is the maximum values of voltage E0 and current I0 in a cycle.
2. Instantaneous value: This is nothing but the value of alternating current and voltage at an instant t.
3. Mean or average value: The value of DC which sends the similar charge in a circuit in the same time frame as sent by the AC in half time period, is known as mean or average value of AC.
4. Root mean square value/effective/virtual value: The amount or value of DC which is capable of producing the same heating effect in a specific resistor as is produced by the given AC when passed for an equal amount of time is known as RMS value of alternating current.
• Phasor diagram: A diagram which we use to represent alternating current and voltage of the same frequency as rotating vectors, along with proper phase angles between them is known as a phasor diagram. It tells you the phase difference between the EMF or voltage and the current in an alternating current circuit.
• Impedance: It is the effective resistance of the series LCR-circuit. The circuit opposes the current flow.
• Reactance: Reactance is the non-resistive opposition to the flow of alternating current.
• Conductance: Conductance is just reciprocal or opposite of resistance.

These are some of the significant topics and definitions explained in Chapter 7 – Alternating Current. There are many more topics which you can go through and have an in-depth idea of the concepts.

## Exercise discussion of NCERT Exemplar Solutions Chapter 7 – Alternating Current

• The 26 specially designed questions of the NCERT Exemplar Problems Class 12 Physics Chapter 7 are designed so that you can get an idea of all the types of questions that may be asked in the exams. The different types of questions prepare you for higher aptitude and skill-based application of the concepts that you have learnt in the chapter. The questions, as discussed earlier, have been categorised as MCQs, very short answers (VSAs) short answers (SAs) and long answers (LAs).
• There are 13 MCQ questions. You will be given options and have to choose the correct one. 7 very short answer questions are there. These questions check your ingrained knowledge about all the topics and concepts provided in the chapter.
• Short answer questions are 6 in number. They will test your ability to use the given concepts for answering the questions.
• There are 5 long answer questions. You need to answer them in an elaborate manner. You must have adequate knowledge to back your answers with apt reasoning.
• All these 26 questions will prepare you to face any and every type of questions that may come in the examinations.

## Why use NCERT Exemplar Class 12 Physics Solutions Chapter 7 –Alternating current by Instasolv?

The Exemplar problems are not that easy. Their purpose is to enhance your skills, and so they are designed in a difficult manner. If you ever find yourself in doubt, then refer to Instasolv’s NCERT Exemplar Physics Class 12 Chapter 7.  To score well in the exam, you should only look up to NCERT Solutions and NCERT Exemplar Class 12 Physics Solutions as they are self-sufficient and cover the entire syllabus of CBSE.

Experts have come up with easy and simple answers and solutions to these Exemplar problems. Using this book will help you to brush up all the concepts and prepare yourselves for all sorts of tricky questions. We help you to come up with flying colours.

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