NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves
NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves are prepared to help students understand one of the most important topics in modern physics. These solutions cover every question from the NCERT textbook with clear, step-by-step explanations. Whether you are preparing for board exams or competitive entrance tests like JEE and NEET, Myclass24 brings you accurate and student-friendly answers that make this chapter easy to grasp. Also, get subject-wise NCERT Solutions for class 12, for all chapters of Physics, check NCERT Solutions for class 12 Physics.
Find the PDF of NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves
Students can download the free PDF of NCERT Solutions for Class 12 Physics Chapter 8 – Electromagnetic Waves from Myclass24. The PDF contains solved answers to all textbook questions, well-drawn diagrams wherever required, and explanations that match the CBSE marking scheme. Simply visit the Myclass24 website, navigate to Class 12 Physics, and find Chapter 8 to access or download the solution PDF at no cost. Having the PDF handy during revision allows you to study without an internet connection and make notes directly alongside the solutions.
Chapter 8 Details at a Glance
Detail | Information |
Chapter Number | 8 |
Chapter Name | Electromagnetic Waves |
Subject | Physics |
Class | 12 |
Board | CBSE / NCERT |
Number of Exercises | 2 (Exercise 8.1 and Additional Exercises) |
Total Questions | 15 |
Key Topics | Maxwell's equations, EM spectrum, displacement current, speed of EM waves |
Available Format | PDF (Free Download) |
What is Chapter 8 – Electromagnetic Waves About?
Chapter 8 is a fascinating chapter that explores how electric and magnetic fields combine to form waves that travel through space without any medium. Maxwell's modification of Ampere's law introduced the concept of displacement current, and this single idea changed everything. It predicted that changing electric fields could produce magnetic fields, just like changing magnetic fields produce electric fields. This mutual induction gives rise to electromagnetic waves.
The chapter explains how these waves travel at the speed of light (3 × 10⁸ m/s in vacuum) and carry both energy and momentum. Students learn about the full electromagnetic spectrum – from radio waves at the low-frequency end to gamma rays at the high-frequency end. Each type of wave has different wavelengths, frequencies, and practical applications.
One important concept here is that EM waves are transverse in nature – the electric and magnetic fields oscillate perpendicular to each other and to the direction of wave propagation. This chapter also discusses the properties of EM waves: they don't need a medium, they travel at the speed of light, and the ratio of electric field amplitude to magnetic field amplitude equals the speed of light (E₀/B₀ = c).
Students often struggle with the derivation of displacement current and the energy density expression. The NCERT solutions on Myclass24 break these down into simple, logical steps. The exercises also test numerical ability – calculating the wavelength, frequency, or intensity of EM waves. Regular practice of these problems builds the confidence needed to score full marks.
How to Use NCERT Solutions for Chapter 8 Effectively
Start by reading the relevant pages in your NCERT textbook and trying the questions on your own. Then cross-check with Myclass24's solutions to see where your approach differed. Pay attention to how formulae are applied, how diagrams are drawn, and how marks are allocated in multi-step problems. Make a separate notes page for key formulae and definitions from this chapter. Attempt past CBSE board papers and sample papers on Chapter 8 after completing the NCERT exercises. This cycle of reading, solving, and reviewing is the most reliable way to prepare.