Hi CUET aspirants, Welcome to Amans Maths Blogs (AMBIPi). In this post, you will get CUET Physics Study Materials Electromagnetic Waves Notes AMBIPi. This CUET Physics Notes are designed by analyzing to the CUET Syllabus and CUET Previous Years Questions Papers.
CUET Physics Notes
CUET Physics Electromagnetic Waves: Important Points to Remember
There are following important points in this chapter of Electromagnetic Waves.
- The electric and magnetic field vectors E and B are always perpendicular to the direction of propagation of electromagnetic waves. Hence the electromagnetic waves is a transverse wave.
- The cross product E × B always gives the direction of propagation of electromagnetic wave.
- The two fields (i.e., electric and magnetic) must vary sinusoidally, with the same frequency and in phase with
each other in electromagnetic wave. - The ratio ω/K for a traveling wave is its speed.
- Electromagnetic wave has linear momentum as well as energy. That is why electromagnetic wave exerts radiation
pressure on the surface of object on which it falls. - All the electromagnetic waves of different radiations move with same speed in vacuum but they move with different
speeds in a medium. - Poynting Vector: The rate of flow of energy crossing a unit area by electromagnetic radiation is given by poynting vector S where
- Displacement current: In a region of space in which there is a changing electric field, there is a displacement current
defined as
where where ε0 is the permittivity of free space and 
is the electric flux. - Infrared waves sometimes are called as Heat waves. It is also produced by hot bodies and molecules. Human eye can not detect them but snakes can detect them.
- The concentration of electrons is very large in region of Kennell Heaviside layer and Appleton layer of ionosphere
but concentration is heavier in Appleton layer than Kennelly heaviside layer. - Practically most of radiation of wavelength less than 400 Å are absorbed by ozone layer and upper part of atmosphere and ionosphere.
- Electrical conductivity of earth atmosphere increases with altitude.
- From the ionosphere layer of atmosphere, radio & microwaves are reflected back.
- Microwaves are the relevant waves in tele-communication.
- Microwaves are used in operating a RADAR.
- Accelerated charge particle produces electromagnetic wave.
- A radar using microwave can help in detecting the speed of tennis ball, cricket ball, automobile while in motion.
- Microwave are used for observing the movements of trains, rails, while sitting in a microwave operated control rooms.
CUET Physics Electromagnetic Waves: Important Formulas
1. Displacement Current, Ampere-Maxwell Law, Velocity, Amplitude, Energy Density.
2. Maxwell’s Equations
CUET Physics Mock Test
Now, you have revised the this CUET Physics chapter. So, you must need to practice CUET Physics Sample Papers. By solving these CUET Physics questions, you will be more confident about your CUET preparations.
