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# NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves

NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves will guide you in the proper preparation of the chapter with a thorough revision and practice for your CBSE exams. The chapter includes various concepts like the electromagnetic spectrum, electromagnetic waves, Maxwell’s theory, radio waves, infrared waves, microwaves etc.

NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves has 1 exercise and 15 questions which are all informative and diverse in nature. All of these questions are based on the fundamentals and basics of the chapter. The chapter has short answer questions, analytical questions, numerical based problems, reasoning questions, derivation-based problems and simple formula assigning problem on topics like Maxwell’s Equations, electromagnetic waves, the nature of electromagnetic waves, wavelength and frequency of electromagnetic waves etc.

NCERT Solutions for Electromagnetic waves will provide you with a simplified way of learning. The exercises cover all the nooks and corners of the chapter and ensure that you develop a firm command on the basics of the chapter through thorough practice. Instasolv’s NCERT Solutions for ‘Electromagnetic Waves’, have been carefully organized by a team of experienced individuals who understand your learning requirements.

## Important Topics for NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves

Electromagnetic waves

NCERT Class 12 Physics Chapter 12 will play a very important role in your understanding of the electromagnetic waves and their existence. You will learn that the electromagnetic waves are produced through the accelerated charges which radiate these waves. This phenomenon is based on the theory given by a scientist named Maxwell.

According to the theory given my Maxwell, the electric and the magnetic fields in an electromagnetic wave are perpendicular to each other and are in the direction of the propagation of the wave. These electromagnetic waves also carry energy and momentum just like the nature of other waves. Light is an example of an electromagnetic wave.

The difference in various kinds of electromagnetic waves is a result of the variations they have on the basis of their wavelengths, their frequencies and the modes of interaction they have with the matter.

Electromagnetic Spectrum

The electromagnetic waves exist in numerous forms which have a separate electromagnetic spectrum. In this chapter, you will learn that the electromagnetic spectrum includes the visible light, the gamma rays, the x rays, radio waves, the microwaves, the ultraviolet rays and the infrared waves.

This classification of waves has been carried out on the basis of their frequencies, and this frequency is also the reason for the specific placement of these waves on the spectrum. This classification is also on account of the way in which these waves are produced and the means in which they are detected.

The frequencies of different electromagnetic waves are given as –

1. Radio waves – more than 0.1 m
2. Microwave – o.1 m to 1 mm
3. Infrared waves – 1 mm to 700 mm
4. Light – 700 mm to 400 mm
5. Ultraviolet rays – 400 mm to 1 mm
6. X rays – 1 mm to 0.001 mm
7. Gamma rays – less than 0.001 mm

In this chapter, you will also learn about the characteristics of each of these waves, their mode of production and their means of detection.

Exercise Discussion of NCERT Solutions for Class 12 Chapter 8 – Electromagnetic Waves

• The exercise begins with a very basic diagram-based question where two circular plates which make a capacitor are represented and their radius is given, the charging current constant of the capacitor is also given in the question and you are required to find the capacitance, the rate of charge of potential difference, the displacement current across the plates and your observation whether the Kirchoff’s Law is valid on each of those capacitors or not.
• The question not only tests your mathematical skills but your analytical skills are also put to test. Such questions are very important for your CBSE final exams and with a bit of attention and practice, they can fetch you a very good score too.
• The chapter further has some short answer questions like question 8.10 where you need to tell the value of the wavelength of a wave and with very simple calculations find the magnetic strength of the field and the energy density of the electric field.
• Question 8.11 and 8.12 are also of a similar kind. These questions have multiple parts and require simple formula based understanding and approach.
• Question 8.15 is a descriptive approach to the chapter and requires theory-based answers. There are questions which require reasoning, like the one which requires you to justify why the long-distance radio broadcasts make use of short wavebands.
• One of the questions also requires you to justify why the ozone layer which is present on the top of the stratosphere is essential for the survival of human beings. Overall there are various kinds of questions which have covered all the essential portions of the chapter in a very engaging manner.

## Benefits of NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves by Instasolv

Our expert team at Instasolv has made sure that all the solutions are presented in a simple and student-friendly manner. We ensure that you build up a solid understanding of the chapter and all its core concepts. Each and every question has been tackled by our team in a stepwise manner with well-organized explanations. All the answers are in our NCERT Solutions for Class 12 Chapter 8, follow the latest CBSE Syllabus.

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