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Sunday, April 17, 2022

EMT - CHAPTER 11 - ELECTROMAGNETIC WAVES AND PROPAGATION (Teaching Videos)

CHAPTER 11: Electromagnetic Waves and Propagation

The objectives:

- To learn about the behavior of electromagnetic waves

- To learn the behavior of electromagnetic waves when interact with different media; conductor, dielectric (lossy / lossless), and free space.

- To learn about Poynting vector; to determine the power of electromagnetic field.



Part 2: Helmholtz Equation and Propagation of Plane waves:

- You will learn the basic concept of propagation for electromagnetic wave using derivation of Helmholtz equation. You can see how E-Field and H-field co-exist for time varying field and how we can express the wave in term of mathematical expression.



Part 2a: Helmholtz Equation and Propagation of Plane waves (Example):

- You will learn the basic concept of propagation for electromagnetic wave using derivation of Helmholtz equation. You can see how E-Field and H-field co-exist for time varying field and how we can express the wave in term of mathematical expression.



Part 3: Plane wave in Lossy Media:

In part 3, you will learn the behavior of plane wave when going through the lossy media (dielectric - Lossy). The example is also given for more explanation. 



Part 4: Plane wave in Lossless and free space media:

In part 4, you will learn the behavior of plane wave when going through a lossless media (dielectric - Lossless) and free space. 


Part 5: Plane wave in conductor:

In part 5, you will learn the behavior of plane wave when going through a conductor.


Part 6: Power and Poynting Vector

In part 6, you will learn to determine the power for electromagnetic wave using Poynting Vector.




EMT - CHAPTER 10 - FARADAY'S LAW (Teaching Videos)

What we learnt so far is time invariant field. Starting in Chapter 10, we will see the case time varying field. The objectives of Chapter 10 are as followed:

1- To identify the difference between the static field (electric and magnetic field) with the time varying field.

2- To exhibit the phenomena whereby the current is produced by the time varying magnetic field, i.e: Faraday’s Law.

3- To investigate on the changes of Maxwell’s equation for time varying field (due to Faraday’s Law).

Part 1 - Introduction to Faraday's Law. 

You will also learn about Faraday's law and Lenz's law.



Part 2 - Three Conditions of Faraday's Law:

Induced EMF can be generated in three conditions; a static circuit in time varying magnetic field, moving circuit in time invariant magnetic field, and moving circuit in time varying magnetic field. We will see how we can do the analysis for all conditions.



Part 3 - Displacement Current.

For Time invariant current source, the current cannot pass through capacitor as it look like open circuit based on the construction of the capacitor which is two conductor separated by dielectric material.

However, the current exist when we supply the capacitor circuit with a time varying current source. The current is known as displacement current.

This Sub-topic will discuss how the displacement current can be derived by using continuity current equation as well as Maxwell equation.



Part 4 - Maxwell equation. 

This part will summarize the 4 Maxwell equations that being the core for EMT. We also will see how Maxwell equation are used to derive the loss tangent for lossy dielectric material.