NCERT Solutions Class 12 Physics Chapter 8 - Electromagnetic Waves

The physics curriculum for class XII, chapter 8, titled "Electromagnetic Waves" is a culmination of all the topics learned prior. It is through electromagnetic waves that the link between electromagnetic theory and optical theory has been established due to the fact that electric and magnetic fields (that are continually changing) move through space in the form of waves. This chapter also begins with the resolution of a conflict within Ampere's Law, which led to the introduction of the "Displacement Current" concept, published by James Clerk Maxwell. This concept was central to providing complete representation of all classically defined electromagnetic events, in the seven equations. Understanding Chapter 8 of Class XII Physics is necessary to understand how radio, television, and mobile phones transmit information, and therefore is considered to be one of the most important areas of study for both the CBSE (Central Board of Secondary Education) Board Examination and for an array of different competitive examinations such as JEE (Joint Entrance Examination) and NEET (National Eligibility cum Entrance Test).

The solutions provided from the NCERT for Class XII Physics Chapter 8 ("Electromagnetic Waves") will assist students in visualising the transverse nature of the various kinds of electromagnetic waves via the breakdown of the Electromagnetic Spectrum from low wavelength (long wave) (i.e. radio waves), to high frequency (gamma rays) (high energy).

1.0Download NCERT Solutions Class 12 Physics Chapter 8 Electromagnetic Waves: Free PDF

In order to study electromagnetic waves, you must first develop a conceptual grasp of the wave's characteristics and how they carry energy. The following documents contain NCERT Solutions to the exercises of the NCERT books for the electromagnetic waves. The NCERT Solutions contain complete detailed information about the Electromagnetic Waves, including how to calculate their momentum and intensity and the relationship of their electric and magnetic fields. Students can save these solutions in PDF form to help them learn the different types of waves within the electromagnetic spectrum and to understand how to use them in various applications and how to create those types of waves.

2.0Class 12 Physics Chapter 8 Electromagnetic Waves: Key Concepts

This chapter focuses on the prediction, properties, and classification of electromagnetic radiation. The key lessons include:

• What is Displacement Current? Which is Mater?
• To clarify, displacement current is the term that has been assigned to the modification of the original amperes circuit law. The reason for making this change was the existence of time varying electric fields (as in charging capacitances) and hence the need for maxwells change to the circuital law.
• Maxwells equations contain the basic four types of electromagnetic phenomena for all of electromagnetism.
• The nature of an EM wave is transverse in nature. An EM wave does not require a supporting medium to propagate. All EM waves propagate at the speed of light when traveling in a vacuum.
• EM Waves carry energy and also apply "radiation pressure" to any surface on which the wave impinge.
• The electromagnetic spectrum has individual sections or regions defined for example radio, microwave, infra-red, visible light, UV, X Ray, and gamma rays.
• How EM Radiation is Utilised/Applied? for example: microwave ovens, Radar, medical imaging, Telecommunications, etc.

3.0Key Features of NCERT Solutions for Class 12 Physics Chapter 8

• Spectrum Mastery: In these solutions, every aspect of the electromagnetic (EM) spectrum is classified according to the Wave/Source/Frequency/Wavelength/Primary Use. Thus, using the solutions will help students better understand the organization of the EM spectrum.
• Calculating Field Relationships: Many current board examinations will ask students to calculate the ratio between an Electric & Magnetic Field Amplitude ($E/B=c$) based on the equations contained within the solutions. Here, the solutions provide students with clear explanations.
• Displacement Current Conceptualization: The solutions take the abstract concept of Displacement Current, and ground the student in the real-world by using the practical example of a Charging Capacitor.
• Simplified Wave Equations: The solutions provide a detailed breakdown of the Wave Equation for sinusoidal Electric & Magnetic Fields to assist the student in identifying the Direction & Frequency of Waves.
• Concise Qualitative Responses: The nature of this chapter is very descriptive, therefore the solutions are written in a concise manner to provide a definitive “keyword based” response that fits the CBSE grading criteria.