This is the 2026-27 edition of the Electromagnetic Waves NCERT PDF, the latest NCERT print of Class 12 Physics Chapter 8 Electromagnetic Waves. The Electromagnetic Waves NCERT PDF on this page replaces older editions in school libraries and on every CBSE recommended-reading list. Use the Electromagnetic Waves NCERT PDF for full-chapter study or jump to any section using the page-by-page map below.
- CBSE Weightage: 2-3 marks (low weight, MCQ-heavy)
- JEE Main Weightage: 1-2% (1 question per paper)
- NEET Weightage: 1 question per year (recurring EM spectrum template)
Both downloads of the Electromagnetic Waves NCERT PDF on this page are free and updated for the 2026-27 NCERT syllabus.
This NCERT Book PDF page is curated by subject experts, mapped to the 2026-27 NCERT edition, and refined against the last five years of CBSE Board, JEE Main, and NEET papers.
How will the Electromagnetic Waves NCERT PDF on Collegedunia Help You?
Chapter 8 is short but dense with definitions and band data NEET examiners love to test. The benefits below explain how this page squeezes maximum mileage from a 16-page chapter.
- 2026-27 NCERT Alignment: Section, example, and exercise counts match the current NCERT print.
- Single-Sitting Plan: One-day plan tailored to the chapter's small size.
- Print-Friendly Tips: Page ranges flagged for selective printing.
- PYQ-Anchored Reading: Each section tagged with the exam it most frequently appears in.
Electromagnetic Waves Video Chapter Walkthrough
Source: NCERT Wallah on YouTube
NCERT Section-by-Section Breakdown for Class 12 Physics Chapter 8
The chapter divides cleanly into four sections covering the conceptual route from Maxwell's correction to the full EM spectrum. The table below lists each section with the page band you will find it on inside the official PDF.
| Section | Title | Page Range | What it Covers |
|---|---|---|---|
| 8.1 | Introduction | 1-2 | Maxwell's unification of electricity and magnetism. |
| 8.2 | Displacement Current | 3-6 | Capacitor-charging inconsistency, definition of Id, Ampere-Maxwell law. |
| 8.3 | Electromagnetic Waves | 7-11 | Transverse nature, speed c, energy density, momentum, intensity. |
| 8.4 | Electromagnetic Spectrum | 12-16 | Seven bands with sources, wavelength ranges, and uses. |
Section 8.2 and Section 8.4 carry the bulk of the exam weight; Section 8.1 is a one-read conceptual setup. Treat Sections 8.2 and 8.4 as primary, and Sections 8.1 and 8.3 as supporting reads.
Intext Example Inventory for Chapter 8 Electromagnetic Waves
The chapter contains three intext Examples that anchor the three core formulae. solving each of them once is enough preparation for the corresponding CBSE 2-mark question type.
| Example | Sub-topic | What it Covers |
|---|---|---|
| Example 8.1 | Displacement Current in a Parallel Plate Capacitor | Calculating Id from dE/dt and capacitor geometry. |
| Example 8.2 | Magnetic Field Inside the Capacitor Gap | Applying Ampere-Maxwell law to a region with no conduction current. |
| Example 8.3 | EM Wave Parameters from E0 | Computing B0, wavelength, and frequency from a given electric-field amplitude. |
Together with 15 end-of-chapter Exercises, this gives you 18 solved or solvable problems for a chapter of just 16 pages, a ratio higher than any other Class 12 Physics chapter.
How to Read This Chapter (Recommended Sequence)
Use a three-pass approach: skim, deep read, then practise. Total clock time is about 5-6 hours, which is why this chapter is perfect for a single-sitting study day.
- Pass 1 (45 min): Skim all four sections, mark every defined term (displacement current, transverse, energy density) in pencil. Do not solve anything yet.
- Pass 2 (2 hours): Deep-read Sections 8.2 and 8.3, deriving Id and c on paper alongside the text. Pass over Section 8.1 quickly.
- Pass 3 (2 hours): Work through Examples 8.1-8.3 and then Exercises 8.1-8.15. Verify answers against NCERT solutions only after attempting.
- Final pass (1 hour): Memorise the seven-band EM spectrum forwards and backwards. Write the wavelength range and one use per band on a single flashcard.
Single-Day Study Plan for the 16-Page Electromagnetic Waves PDF
Because the chapter is so compact, the entire NCERT material fits inside a single focused day. The plan below allocates six clock-hours from first read to PYQ practice. Tick each block as you finish; do not skip the intext Examples.
| Hour | Block | Tasks | Output |
|---|---|---|---|
| Hour 1 | Read Sections 8.1-8.4 | Skim every paragraph once. Mark defined terms in pencil. | One-page concept skeleton |
| Hour 2 | Intext Examples 8.1-8.3 | Solve each example without looking at the answer first. Compare after. | 3 solved examples |
| Hour 3 | Exercises 8.1-8.8 | Numerical-heavy first half. Focus on capacitor Id and wave parameters. | 8 exercise answers |
| Hour 4 | Exercises 8.9-8.15 | Conceptual second half. Verify against NCERT solutions after attempting. | 15 exercise answers |
| Hour 5 | EM Spectrum Memorisation | Memorise band order both ways. Write wavelength range + source + one use per band. | Spectrum flashcard |
| Hour 6 | PYQ Practice | Attempt 6 PYQs across CBSE/JEE/NEET. 90 sec per MCQ, 3 min per 2-marker. | 6 PYQs solved |
If you keep to the schedule, the chapter is fully covered by sunset with one round of PYQ exposure. A second pass before the exam window needs only the spectrum flashcard and the formula box, not the full chapter again.
Print-Friendly Tips for the Electromagnetic Waves NCERT PDF
Since the chapter is only 16 pages, almost everyone prints the full PDF. The tips below reduce paper use further if you are managing a multi-chapter print run.
- Print Sections 8.2 and 8.4 in full (pages 3-6 and 12-16); these carry every recurring exam question.
- Compress Section 8.1 to two-pages-per-sheet duplex; the introduction is read once.
- Print Summary and Points to Ponder on a single sheet for last-minute revision.
- Use grayscale; the Electromagnetic Waves NCERT PDF has no colour-critical diagrams.
- Skip front matter if you downloaded the full textbook; print only the Chapter 8 range.
Also Check:
2026-27 Syllabus Changes for Electromagnetic Waves
The current 2026-27 edition trimmed almost nothing from this chapter, because it was already among the shortest. The three biggest things you must know are summarised below; the full edition-by-edition diff sits on the Collegedunia Notes page.
- Kept: Displacement current derivation, the full Ampere-Maxwell statement, the seven-band EM spectrum, energy density and momentum formulae.
- Trimmed: Some of the historical narrative around Hertz's experiment was condensed but not removed.
- Removed: No major topic removed from this chapter in the latest NCERT print.
Full version: Electromagnetic Waves Class 12 Physics Notes
Top 5 Formulae from Chapter 8 Electromagnetic Waves
These are the five formulae that account for every numerical ever asked from this chapter in CBSE, JEE Main, and NEET. The full master table with dimensional checks is on the Collegedunia Formula Sheet.
| Quantity | Formula |
|---|---|
| Displacement current | Id = ε0 (dΦE/dt) |
| Speed of EM wave (vacuum) | c = 1/√(μ0ε0) = 3 × 108 m/s |
| Field amplitude relation | E0 = c B0 |
| Energy density | u = ½ ε0 E2 + B2/(2μ0) |
| Intensity / Momentum | I = ½ c ε0 E02; p = U/c |
Full master table: Electromagnetic Waves Class 12 Physics Formula Sheet
3 Recurring PYQ Trends for Chapter 8
The list below captures the three question templates that appear nearly every year across CBSE, JEE Main, and NEET. The full year-by-year PYQ map is on the NCERT Solutions page.
- EM Spectrum band order and uses - NEET 2024, NEET 2023, CBSE 2025. The single most recurring template.
- Displacement current concept and expression - CBSE 2024, JEE Main 2024.
- E and B perpendicular relation, E0 = c B0 - JEE Main 2025.
Full PYQ map: Electromagnetic Waves Class 12 Physics NCERT Solutions
Related Links:
- Ray Optics and Optical Instruments Class 12 Physics Notes
- Alternating Current Class 12 Physics Notes
More Electromagnetic Waves Physics Class 12 Resources
NCERT Book PDF for Class 12 Physics: All Chapters
Other Class 12 Physics NCERT Book PDFs you can grab as free downloads:
| Chapter | Resource |
|---|---|
| Chapter 1 | Electric Charges and Fields NCERT PDF |
| Chapter 2 | Electrostatic Potential and Capacitance NCERT PDF |
| Chapter 3 | Current Electricity NCERT PDF |
| Chapter 4 | Moving Charges and Magnetism NCERT PDF |
| Chapter 5 | Magnetism and Matter NCERT PDF |
| Chapter 6 | Electromagnetic Induction NCERT PDF |
| Chapter 7 | Alternating Current NCERT PDF |
| Chapter 9 | Ray Optics and Optical Instruments NCERT PDF |
| Chapter 10 | Wave Optics NCERT PDF |
| Chapter 11 | Dual Nature of Radiation and Matter NCERT PDF |
| Chapter 12 | Atoms NCERT PDF |
| Chapter 13 | Nuclei NCERT PDF |
| Chapter 14 | Semiconductor Electronics NCERT PDF |
Electromagnetic Waves NCERT PDF: available above as a free PDF download, fully aligned to the 2026-27 NCERT release.
Electromagnetic Waves NCERT PDF - Frequently Asked Questions
Ques. Where can I download the Electromagnetic Waves NCERT PDF for free?
Ans. You can download the Electromagnetic Waves Ncert Pdf directly from this page. Both the Normal and HD versions are available, and both are free.
Ques. Is this Electromagnetic Waves NCERT PDF aligned with the 2026-27 CBSE syllabus?
Ans. Yes. This page reflects the current 2026-27 syllabus for Class 12 Physics. The chapter retains all four sections (8.1 to 8.4), the displacement current derivation, and the full seven-band EM spectrum.
Ques. How many pages is the Class 12th Physics Electromagnetic Waves NCERT Book PDF?
Ans. The chapter runs about 16 pages, making it the shortest chapter in the Class 12 Physics textbook. It contains roughly 3 intext Examples and 15 end-of-chapter Exercises.
Ques. Can the entire chapter really be covered in a single day?
Ans. Yes. The 6-hour single-day study plan on this page allocates reading, intext Examples, exercises, spectrum memorisation, and PYQ practice in a way that fits inside one focused study day.
Ques. What is the correct order of the electromagnetic spectrum?
Ans. In order of increasing wavelength: gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves, and radio waves. Reverse this list for increasing frequency.
Ques. What is displacement current as defined in the NCERT chapter?
Ans. Displacement current is the term Id = ε0 (dΦE/dt) added by Maxwell to Ampere's law. It accounts for the magnetic field produced by a time-varying electric field even where no charge is physically moving (such as the gap of a charging capacitor).
Ques. Is the NCERT chapter sufficient for NEET and JEE on this topic?
Ans. For NEET the NCERT chapter alone is sufficient because the question is almost always on EM spectrum or displacement current. For JEE Main, supplement with 5-10 PYQs on energy density and momentum numericals.
Ques. Which sections of Chapter 8 carry the most exam weight?
Ans. Section 8.2 (Displacement Current) and Section 8.4 (Electromagnetic Spectrum) together account for nearly all CBSE, JEE Main, and NEET questions from this chapter. Section 8.1 is conceptual setup and Section 8.3 supports both 8.2 and 8.4.
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