HC Verma Alternating Current Solutions (Chapter 39)

HC Verma Solutions for Class 12 Physics Part-2 Chapter 39 ‘Alternating Current’ is provided by the experts of Instasolv to help you in understanding the concepts of the chapter thoroughly. It is an important chapter from the exam point of view. So, the complete set of questions-answers are prepared by well-qualified subject teachers after extensive research.

This chapter of HC Verma Class 12 Physics Solutions deals with the topics like AC voltage applied to a resistor, representation of AC current and voltage by rotating vectors, AC voltage applied to a capacitor, AC voltage applied to a series LCR circuit, phasor-diagram solution, analytical solution, resonance, LC oscillations, and transformers. You will find 4 exercises with a total of 51 questions based on these important topics of the chapter.

The simple and lucid solutions provided here in the HC Verma Alternating Current Solutions for the above-mentioned topics will help you to further clarify your concepts. We provide step by step solutions for all the problems provided in HC Verma Class 12 Physics text-book as per CBSE Board guidelines. Also, you can access these solutions at any time for free.

Important Topics for HC Verma Concepts of Physics Part-2 Solutions Chapter 39: Alternating Current

AC Generator or AC Dynamo

AC Generator or we can say Alternating current generator refers to a device that transforms the mechanical energy into electric energy. When the coil revolves between the two poles of the magnet, it interrupts the magnetic flux lines which produce the induced EMF and the induced electric current that can be transported through wires for long distances.

Instantaneous and RMS Current

Instantaneous current describes the amount of charge moving through a conductor at any instant.

The RMS current value is described as the “value of the direct current that drives away the same power in a resistor.” The RMS overall time of a periodic function is equivalent to the RMS of one period of the function.

Simple AC Currents

The abbreviations AC and DC are frequently used to mean basically alternating and direct, as when they transform current or voltage. The normal waveform of alternating current in most electric power circuits is a sine wave, whose positive half-period relates to the positive direction of the current and vice versa.

Vector Method

The magnitude and direction of the addition of two or more vectors can also be calculated by the use of a precisely drawn scaled vector diagram. Using a scaled diagram, the head-to-tail technique is employed to regulate the vector sum or resultant.

Choke Coil

A choke coil is a coil used in electrical circuits to permit DC current to stream through while obstructing AC current from passing. These coils are used in various electrical devices. When used as a portion of a radio’s circuitry, it falls into one of two frequency classes including audio or radio.


An inactive electrical device that transmits electrical energy from one or more electrical circuits is known as a transformer.

Hot Wire Instruments

The devices which use the heating effect of the current for the significance of their magnitude such type of instrument is called the hot wire instrument. It works on the phenomenon that the length of the wire rises because of the heating effect of the current passing through it.

Exercise-wise Discussion for HC Verma Concepts of Physics Part-2 Solutions Chapter 39: Alternating Current

Exercise 1 – Short Answer Type Questions

The first exercise of the chapter has around 14 questions which are short answer type questions. These questions are based on the importance of AC Generator or AC Dynamo, instantaneous and RMS current, and simple AC currents.

Exercise 2 – Objective Type Questions I

This exercise has around 11 multiple-choice questions which are entirely based on topics like vector method, AC circuits, choke coil, and transformer.

Exercise 3 – Objective Type Questions II

This exercise set has a total of 7 questions that are also multiple-choice questions. In these questions, you need to choose the right answer from the options available. You can have two or more statements correct.

Exercise 4 – Long Answer Type Questions

This exercise set has a total of 19 questions in which you need to provide the proper explanation of why a situation happened. This exercise also has questions consisting of figures of the circuit which makes it easier for you to understand the question.

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  • We provide step by step solutions for all the problems provided in HC Verma Concepts of Physics Part 2 book as per the latest CBSE guidelines.
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