CBSE Class 12th Physics Chapter 8 - Electromagnetic Waves Important Questions with Answers

You should focus on solving CBSE Class 12th Physics Chapter 8: Electromagnetic Waves important questions, especially to help you score high marks. By solving CBSE Class 12th Physics 8 questions, you will be solving exam-oriented questions only.

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CBSE Class 12th Physics Chapter 8 - Electromagnetic Waves Important Questions with Answers are provided here to help you score more marks. Only completing the CBSE 12th Physics syllabus 2025 will not work. Alongside, you need to solve the previous year question papers and go through the important questions. In Class 12 Physics, Electromagnetic Waves delves into a type of wave composed of oscillating electric and magnetic fields that travel through space at the speed of light. The chapter focuses on how Electromagnetic Waves are formed by the interaction between electricity and magnetism, propagating without needing a medium to travel through; examples of electromagnetic waves include radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays, all differentiated by their wavelengths and frequencies.

The CBSE Class 12th Physics syllabus 2025 comrprises a total of 9 units and 14 chapters. The total marks allotted for the CBSE 12th Physics paper are 70 marks. The remaining 30 marks will be provided for the Practical Examination. Electromagnetic Waves is chapter 8 of Unit V, Electromagnetic Waves. Both Unit V and Unit VI (Optics) will carry 18 marks in the Physics exam. Both these units will be carrying a maximum weightage in the exam. Prepare thoroughly with the most important questions of CBSE Class 12th Physics Chapter 8 - Electromagnetic Waves. You can first cover the CBSE Class 12th Physics syllabus to understand the key topics and then start solving the CBSE Class 12th Physics Chapter 8 - Electromagnetic Waves Important Question to get a better understanding of your preparation level. Start practicing now.

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How is the speed of em-waves in vacuum determined by the electric and magnetic fields? (Delhi 2017)

Question 2.

Do electromagnetic waves carry energy and momentum? (All India 2017)

Question 3.

Write the relation for the speed for electromagnetic waves in terms of the amplitudes of electric and magnetic fields. (All India 2017)

Question 4.

In which directions do the electric and magnetic field vectors oscillate in an electromagnetic wave propagating along the x-axis? (All India 2017)

Question 5.

How does Ampere-Maxwell law explain the flow of current through a capacitor when it is being charged by a battery? Write the expression for the displacement current in terms of the rate of change of electric flux. (Delhi 2017)

Question 6.

Identify the electromagnetic waves whose wavelengths vary as
(a) 10^-12< ? < 10^-8 m
(b) 10^-3 m < X < 10^-1 m
Write one use for each. (All India 2017)

Question 7.

Identify the electromagnetic waves whose wavelengths lie in the range
(a) 10^-11 m < ? < 10^-8 m
(b) 10^-4 m < ? < 10^-6 m Write one use of each. (All India 2017)

Question 8.

How is electromagnetic wave produced? Draw a sketch of a plane e.m. wave propagating along X-axis depicting the directions of the oscillating electric and magnetic fields. (Comptt. Delhi 2017)

Question 9.

Name the e.m. waves in the wavelength range 10 nm to 10^-3 nm. How are these waves generated? Write their two uses. (Comptt. All India 2017)

Question 10.

Name the type of e.m. waves having a wavelength range of 0.1 m to 1 mm. How are these waves generated? Write their two uses. (Comptt. All India 2017)

Question 1.

Name the type of e.m. waves having a wavelength range 10^-7 m to 10^-9 m. How are these waves generated? Write their two uses. (Comptt. All India 2017)

Question 2.

Why are microwaves considered suitable for radar systems used in aircraft navigation? (Delhi 2016)

Question 3.

For a plane electromagnetic wave, propagating along the Z-axis, write the two (possible) pairs of expression for its oscillating electric and magnetic fields. How are the peak values of these (oscillating) fields related to each other? (Comptt. All India 2016)

Question 4.

How are em waves produced by oscillating charges?
Draw a sketch of linearly polarized em waves propagating in the Z-direction. Indicate the directions of the oscillating electric and magnetic fields. (Delhi 2016)

Question 5.

Write Maxwell’s generalization of Ampere’s Circuital Law. Show that in the process of charging a capacitor, the current produced within the plates of the capacitor is

where ? E is electric flux produced during charging of the capacitor plates. (Delhi 2016)

Question 6.

(i) Identify the part of the electromagnetic spectrum which is :
(a) suitable for radar system used in aircraft navigation,
(b) produced by bombarding a metal target by high speed electrons.
(ii) Why does a galvanometer show a momentary deflection at the time of charging or discharging a capacitor? Write the necessary expression to explain this observation. (All India 2016)

Question 7.

Name the types of e.m. radiations which

are used in destroying cancer cells,

cause tanning of the skin and

maintain the earth’s warmth.

Write briefly a method of producing any one of these waves. (Delhi 2015)

Question 8.

To which part of the electromagnetic spectrum does a wave of frequency 3 × 10¹³ Hz belong? (All India 2014)

Question 9.

Considering the case of a parallel plate capacitor being charged, show how one is required to generalize Ampere’s circuital law to include the term due to displacement current. (All India 2014)

Question 10.

A capacitor is connected in series to an ammeter across a d.c. source. Why does the ammeter show a momentary deflection during the charging of the capacitor? What would be the deflection when it is fully charged? (Comptt. All India 2014)